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engine light on after battery change!

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9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHengine light on after battery change!

Leading reported evidence

Reconnect battery

Performed · outcome unconfirmed

No successful repair reported for this finding.

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Reported fixes
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Unsuccessful attempts
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Discussions
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that performed work without a confirmed outcome
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Performed · outcome unconfirmed

don't turn the ignition off as soon as you have reconnected the battery.

engine light on after battery change!
Frequently discussed work

Adjust itself

No successful repair reported for this finding.

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Discussions that contain suggestions
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Suggestion · Original poster

I could here that it was misfiring (sometimes sounding like it was about to cut out) and gave it a light 30 mile run to see if it would adjust itself but no joy =-(

engine light on after battery change!
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Leading evidence: 'Reconnect battery' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Adjust itself' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

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1 matching discussions · 9 captured posts examined · 0 partial discussions

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Replace maf and the engine light was still

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster

went to the indie today and the coil packs were fine so he changed the maf and the engine light was still on and the diagnostic told us the oxygen sensors are gone so gonna have them done asap....just an update ;-)

engine light on after battery change!

Adjust itself

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

I could here that it was misfiring (sometimes sounding like it was about to cut out) and gave it a light 30 mile run to see if it would adjust itself but no joy =-(

engine light on after battery change!

Check ' engine light

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

I got in the car while the engine was running and noticed the 'check' engine light on.

engine light on after battery change!

Disconnect neg lead

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

If your CEL is now on - disconnect neg lead for 30 seconds or more (key in ignition with dash lights on as you have been doing) reconnect lead, leave ignition on for a minute, turn off, turn back on and fire up and allow the car to idle for a couple of minutes.

engine light on after battery change!
Frequently discussed actions (9)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Adjust itself

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

I could here that it was misfiring (sometimes sounding like it was about to cut out) and gave it a light 30 mile run to see if it would adjust itself but no joy =-(

engine light on after battery change!

Check ' engine light

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

I got in the car while the engine was running and noticed the 'check' engine light on.

engine light on after battery change!

Disconnect neg lead

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

If your CEL is now on - disconnect neg lead for 30 seconds or more (key in ignition with dash lights on as you have been doing) reconnect lead, leave ignition on for a minute, turn off, turn back on and fire up and allow the car to idle for a couple of minutes.

engine light on after battery change!

Reconnect battery

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed

don't turn the ignition off as soon as you have reconnected the battery.

engine light on after battery change!

Reconnect lead, leave ignition

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

If your CEL is now on - disconnect neg lead for 30 seconds or more (key in ignition with dash lights on as you have been doing) reconnect lead, leave ignition on for a minute, turn off, turn back on and fire up and allow the car to idle for a couple of minutes.

engine light on after battery change!

Replace batteries

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

Has anyone else had this after changing batteries?

engine light on after battery change!

Replace battery

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

I didnt start the car that day after changing the battery but started it two days later (today) only to be greeted by the 'check' engine light!

engine light on after battery change!

Replace battery starting

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

Battery died the other day and i put a new one in following the correct procedure (turning the ignition on to the point where any further would start the car, then changing the battery starting with the negative first and connecting it last with the new battery, then switching the ignition off).

engine light on after battery change!

Replace maf and the engine light was still

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster

went to the indie today and the coil packs were fine so he changed the maf and the engine light was still on and the diagnostic told us the oxygen sensors are gone so gonna have them done asap....just an update ;-)

engine light on after battery change!
Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • 911uk: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261027T201111Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Happy new year all uh: Two weeks ago i had a new radiator fitted and the battery died while it was at the garage and there was very little fuel in the car. The garage were charging the battery for me when i came to pick it up. I got in the car while the engine was running and noticed the 'check' engine light on. I told the engineer who was unaware and he said 'it sounds like its misfiring...thats why the light has come on..it could be because theres very little fuel'. He advised me to quickly get fuel and if its still on after, bring it back. The light remained on after i got fuel so i drove back and he plugged in the computer, worked his magic and the light went out after a few seconds and the misfiring stopped. Battery died the other day and i put a new one in following the correct procedure (turning the ignition on to the point where any further would start the car, then changing the battery starting with the negative first and connecting it last with the new battery, then switching the ignition off). I didnt start the car that day after changing the battery but started it two days later (today) only to be greeted by the 'check' engine light! I could here that it was misfiring (sometimes sounding like it was about to cut out) and gave it a light 30 mile run to see if it would adjust itself but no joy =-( To my knowledge the coil packs were changed not long ago by the previous owner (ive only had the car 3 months). Maybe putting the ignition on before disconnecting the negative confuses something in the engine as you can hear something switching on in the engine bay when you turn the key to the point before ignition..then when you connect the new battery with the key still in that position maybe it upsets something...what else could it be..maybe it will be ok when i start it next..will let you know. Has anyone else had this after changing batteries? thanks all ps. the car has been garaged so no moisture/ice/rain has gotten in.

POST 2Original post

didn't this happen to someone when the battery was hooked up or charged with the wrong polarity?

POST 3Original post

European 964s don't have CELs. I believe you want the 996 forum so I'll move this topic there.

POST 4 / ORIGINAL POSTEROriginal post

sorry guys...thought i had posted it there..

POST 5Original post

No probs Peter...hopefully you'll get some help by it being here :thumbs: BTW the 996 is similar to a boxster. When I change the battery in my boxster I do the same as you. However it is important that when you reconnect to put the negative lead on last and then leave the ignitition on for a minute, turn it off and then fire it up. i.e. don't turn the ignition off as soon as you have reconnected the battery. If your CEL is now on - disconnect neg lead for 30 seconds or more (key in ignition with dash lights on as you have been doing) reconnect lead, leave ignition on for a minute, turn off, turn back on and fire up and allow the car to idle for a couple of minutes. If after this, the CEL is on, you have an engine management problem that needs diagnosing.

POST 6 / ORIGINAL POSTEROriginal post

Thanks so much boxsey :thumb: will try it tomorrow...its a strange thing though isnt it? I know i didnt run to the ignition and turn it off as soon as i connected the negative but cant say for sure if i left it for a minute or so either...probably somewhere in between...i will try that anyway. thanks again and have a great night.. :thumbs:

POST 7 / ORIGINAL POSTEROriginal post

Hi Boxsey Hows yr head..lol :? I did what you said and no luck sadly for me..the engine light stayed on and it carried on running with an uneven idle and sounding like it will cut out...didnt drive it this time incase i brake something..will go to an indy tomorrow.. thanks for the help mate happy new year

POST 8Original post

It could be a number of things - coil packs, O2 sensors, MAF. You're doing the right thing to get an Indy to diagnose it. Good luck.

POST 9 / ORIGINAL POSTEROriginal post

Hi Boxsey went to the indie today and the coil packs were fine so he changed the maf and the engine light was still on and the diagnostic told us the oxygen sensors are gone so gonna have them done asap....just an update ;-)

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