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Engine Check often "ON"

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

Discussion summary

YOUR RESEARCHEngine Check often "ON"

Reported or suspected cause

dirty spark plug

Reported cause

No successful repair reported for this finding.

1
Identified cause
0
Suspected cause
0
Reported fixes
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 report identifying a cause
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.

Reported cause

My 99 C2 had the Check Engine light on and the problem was a dirty spark plug.

Engine Check often "ON"
Frequently discussed work

Check engine decided

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

My check engine decided to make an appearance last week after I'd left the car in the garage for a week (my fault - drive the thing!!).

Engine Check often "ON"
Read full discussion summary

Leading evidence: 'dirty spark plug' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'dirty spark plug' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check engine decided' (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.

Read captured replies

1 matching discussions · 11 captured posts examined · 0 partial discussions

Compare 4 other evidence results

Replace mass flow unit

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

Last time the dealer replaced the Mass Flow unit.

Engine Check often "ON"

check engine light and the leak were not related

Suggestion or failed attempt

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
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 suspect a cause
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.

Suspected cause

Most likely the check engine light and the leak were not related.

Engine Check often "ON"

oxygen sensors

Suggestion or failed attempt

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
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 suspect a cause
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.

Suspected cause

The CE light is most likely an O2 sensor which should only take an hour or two to fix.

Engine Check often "ON"

Check engine decided

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

My check engine decided to make an appearance last week after I'd left the car in the garage for a week (my fault - drive the thing!!).

Engine Check often "ON"
Frequently discussed actions (5)

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

Check engine decided

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

My check engine decided to make an appearance last week after I'd left the car in the garage for a week (my fault - drive the thing!!).

Engine Check often "ON"

Check paperwork

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

I would check your paperwork from the last time your car was in the shop.

Engine Check often "ON"

Fill us in

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

Maybe some of the warm weather folks have already had it done and can fill us in.

Engine Check often "ON"

Replace asap

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

No luck, ...I advice you also to change asap, for another Porsche center.

Engine Check often "ON"

Replace mass flow unit

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

Last time the dealer replaced the Mass Flow unit.

Engine Check often "ON"
Reported and suspected causes (3)

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

dirty spark plug

No successful repair reported for this finding.

1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that report identifying a cause
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.

Reported cause

My 99 C2 had the Check Engine light on and the problem was a dirty spark plug.

Engine Check often "ON"

check engine light and the leak were not related

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect a cause
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.

Suspected cause

Most likely the check engine light and the leak were not related.

Engine Check often "ON"

oxygen sensors

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect a cause
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.

Suspected cause

The CE light is most likely an O2 sensor which should only take an hour or two to fix.

Engine Check often "ON"
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.

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

  • Rennlist: 1 discussions

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

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

Outcome without a verified action link

The leak is a common problem with the 99s and it's good that you got it fixed.

No unique explicit quoted action; no causal link assigned

Generation: 20261027T073501Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I have a'99 996 with full Gemballa bodykit. Problem that i have with this car is the engine light always turn on. The last time the engine light turn "on" is 2 months ago, and the car was sitting in the dealer for almost a week.They said that the oil is leaking from my transmission and have to be repair. now, the engine check is lit again, and my warranty almost experied. It a common problem happening in 996? Do you think any one can refer me to inexpensive realible mechanic or is it better for me to buy an extended warranty from dealer (expensive). I am located in long beach area (California) and my car had only 21000 mi. <img src="graemlins/cussing.gif" border="0" alt="[grrrrrrr]" />

POST 2Original post

I would check your paperwork from the last time your car was in the shop. Most likely the check engine light and the leak were not related. The leak is a common problem with the 99s and it's good that you got it fixed. The CE light is most likely an O2 sensor which should only take an hour or two to fix. I was told last fall that Porsche was coming out with fix for this problem. Maybe some of the warm weather folks have already had it done and can fill us in. Jim

POST 3Original post

Sorry to hear about the problems. If it's the main rear seal leaking on your '99, then it's a well known problem, but not a cause for your check engine light. I think there was a TSB out about the gas cap seal, or something similar. Ask your dealer about that as I think that causes the check engine light. With regard to SoCal dealer service departments, Newport Auto Center, Russ Mann, has always taken good care of me. By reputation, Circle Imports right in Long Beach is supposed to have an excellent service department. No experience with them, just heard about it from more than one source. Good Luck!

POST 4Original post

Agree with Jim B. Check engine light on my car has always been related to either the MassFlow or O2 sensor. Last time the dealer replaced the Mass Flow unit. As they pointed out to me, the check engine light is yellow meaning the car should be driveable with no damage for a short time. Also, most Porsche warranties are from the date of the repair and not the delivery date.

POST 5Original post

No luck, ...I advice you also to change asap, for another Porsche center. Let's work the competence between dealer's quality work repair. Hope it helps.

POST 6Original post

Could be as simple as not enough oil in the engine. If you read 2 qts. low, it will go on.....

POST 7Original post

My 99 C2 had the Check Engine light on and the problem was a dirty spark plug.

POST 8Original post

Could also be a loose gas cap. Not enough fuel pressure will turn the light on..... 50 cycles for it to turn back off.

POST 9Original post

I had a '99 C2 cab and towards the end, before I traded it it for an '02 cab, the check engine light went on about a half hour after I bought gas and went off a few days later (the car was a daily driver). And, I had the new gas cap which was a common warranty item on this model.

POST 10Original post

Ive had my 99 for 2 and 1/2 months. The check engine light has come on 3 times so far.

POST 11Original post

[quote]Originally posted by Porscherenter: <strong>Could also be a loose gas cap. Not enough fuel pressure will turn the light on..... 50 cycles for it to turn back off.</strong><hr></blockquote> FIFTY cycles??? My check engine decided to make an appearance last week after I'd left the car in the garage for a week (my fault - drive the thing!!). I'd just taken the car for a leasurely drive and it came on. The gas cap seems fine, but I did notice that my oil dipstick was slightly out - I pushed it firmly back in - presumably this is enough to cause the problem?? My dealer told me to keep driving the car for at least THREE cycles and then see if it goes out. Of course, it didn't and I'm probably still only up to 10 or so cycles. However, there's a big difference between 3 and 50! Can any give me a definitive view on this?? Thanks, <img src="graemlins/c.gif" border="0" alt="[ouch]" />

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