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YOUR RESEARCHO2 sensor check - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Check airfilter and shall
Performed · outcome unconfirmed
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Unsuccessful attempts
1
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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.
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Performed · outcome unconfirmed · Original poster
I have checked airfilter and shall replace the sparkplugs soon through matter of course, I assumed the O2 sensors may be to blame, as fuel economy seems a little low, averaging around 32 miles/gallon.
O2 sensor check - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Check airfilter and shall' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check airfilter and shall' (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.
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
I have replaced my O2 sensors, however I want to check that they are working as seems the car srunning a little rich.
O2 sensor check - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Check throttle body and idle air controll valve
Suggestion or failed attempt
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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 contain suggestions
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Suggestion
check your throttle body and idle air controll valve for coking [crud].
O2 sensor check - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Repair any other ideas
Suggestion or failed attempt
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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.
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Suggestion · Original poster
The high-ish reving ad idle seems to be a little worse since these have been repaired, Any other ideas?
O2 sensor check - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace number
Suggestion or failed attempt
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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 contain suggestions
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
if your scan tool has a "02 cross counts" look for a changing number ,this means its going above and below .450 mv.
O2 sensor check - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Frequently discussed actions (8)
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check airfilter and shall
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
I have checked airfilter and shall replace the sparkplugs soon through matter of course, I assumed the O2 sensors may be to blame, as fuel economy seems a little low, averaging around 32 miles/gallon.
O2 sensor check - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace starter motor, as it is noisy
No successful repair reported for this finding.
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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.
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Suggestion · Original poster
Next big job is replacing the starter motor, as it is noisy on startup, clogging up on the benedics, I have a replacement and plan on reconditioning the old one to sell on ebay
O2 sensor check - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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.
986Forum: 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: 20261027T042512Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi folks,
I have replaced my O2 sensors, however I want to check that they are working as seems the car srunning a little rich. Ca someone please give me simple instructions on how to test that they are working please?
Many thanks,
Paul
Yes i do,
However I am guessing the figures i receive are from the ECU and not directly from the O2 sensor.
I have included a photo of the results.
I only have 2 O2 sensors on my model, precat sensors, later models had an additional 2 after the cat.
Cheers,
Paul.
if your scan tool has a "02 cross counts" look for a changing number ,this means its going above and below .450 mv. ....or you can monitor the 02 data while you give the motor a small vac. leak. with the system hot and idling in closed loop .450 mv is what its trying to maintain...so expect the numbers to move around [depends on the tools sample rate] ...a lab scope is better but DONT EVEN DREAM ABOUT BACK PROBING THE 02 WIRES. quickly press and release the gas pedal and look for high mv,next if you can safely go WOT for a few seconds look for .900/950 mv while on the highway at say 5000 rpm upward. OR if the check engine light isnt on dont do anything ....they are working
Thanks for the info, much appreciated.
I shall try testing it over 5k rpm as you suggested.
My car seems to idle a little fast at times, especially when i come to a stop (say at traffic lights) after a high rpm run.
It is also running a little rich apparantly which is causing the high emission levels during my recent test,
I was told this may be the sensors, however I am not receiving any error codes. I had holes in the exhaust but these are fixed. The high-ish reving ad idle seems to be a little worse since these have been repaired, Any other ideas? I have checked airfilter and shall replace the sparkplugs soon through matter of course, I assumed the O2 sensors may be to blame, as fuel economy seems a little low, averaging around 32 miles/gallon. Is this normal?
The car is running fine though, starts fine and is causing me no real problems except a slightly high idle, generally 1k rpm, sometimes it revs up to 1.5rpm and then drops again. It makes the car infront think I am getting impatient
Any ideas would be gratefully received.
Many thanks.
Paul.
check your throttle body and idle air controll valve for coking [crud]. if it failed a smog test i would think it will force a CEL . an exhaust leak can fool the 02 sensors making them think the car is lean so they richen the mix. look at injector on time [mil/sec] ....you will need normal specs to compare
Thanks again for the info,
Much appreciated. Will see what I can find.
Next big job is replacing the starter motor, as it is noisy on startup, clogging up on the benedics, I have a replacement and plan on reconditioning the old one to sell on ebay
I shall check the throttle body and idle air control valve as you say.
Cheers
Paul.
Yup, I have instructions on how to dismantle and lube the starter, its the same starter motor as a VW apparantly. However I bought a cheap one on Ebay, that way I can do a direct replacement, and it doesn't matter too much if I drop a spring or screw down the back of the cooker while I am reconditioning it, I can still get to work the next morning haha.
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