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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCross post from 987 Board: Dealer recommends DME replacement after CEL
Leading reported evidence
Check postcat sensor and see
Suggestion or failed attempt
No successful repair reported for this finding.
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1
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Read evidence and context
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Suggestion
2) check the postcat sensor and see that also reads high
Cross post from 987 Board: Dealer recommends DME replacement after CEL
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Leading evidence: 'Check postcat sensor and see' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check postcat sensor and see' (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.
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Suggestion
1) check wires between bank 1 sensor and DME for shorts and continuity
Cross post from 987 Board: Dealer recommends DME replacement after CEL
Replace sensor?) and how
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Suggestion · Original poster
what is wrong (change sensor?) and how to address?
Cross post from 987 Board: Dealer recommends DME replacement after CEL
Use smartphone (pair
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Suggestion
If you use a smartphone (pair with a wireless OBDII dongle), you can mount it in your line of sight and easily monitor the O2 voltage in real-time as you drive.
Cross post from 987 Board: Dealer recommends DME replacement after CEL
Use smartphone (pair
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 you use a smartphone (pair with a wireless OBDII dongle), you can mount it in your line of sight and easily monitor the O2 voltage in real-time as you drive.
Cross post from 987 Board: Dealer recommends DME replacement after CEL
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7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Thought I would put this here as this issue I am facing with my 987.1 Cayman S is with the same generation engine as the 996 cars... anyone with any useful comments or thoughts would be appreciated:
https://rennlist.com/forums/987-981-...place-dme.html
P2196 -- O2 sensor signal biased/stuck rich bank 1 sensor 1
I do have a Durametric, and I have cleared the code for now... I think it will come back after some additional driving. I drove the car about 800 miles since it passed smog with all clear no codes before the CEL came on again.
I have not yet taken it to another shop.
Thanks for your reply.
Since you have Durametric, you can log the voltage of the four O2 sensors and rpm. Best is to log a cold start for 2 minutes. Then once the engine has warmed up, just drive normally stop and go and log for 5 to 10 minutes. Or if you know approximately when the CEL will trip, you can log up to and pass that point.
Basically you're trying to see if the pre-cat sensors (on both banks) swing between 0.3 to 0.7v and the post-cat sensors more or less stay at 0.7v while the engine is idling. Based on the code above assuming Durametric's description is correct you should see bank 1 pre-cat sensor reading high (~0.7v) constantly for sometime.
If you use a smartphone (pair with a wireless OBDII dongle), you can mount it in your line of sight and easily monitor the O2 voltage in real-time as you drive.
thank you - so if the behavior is as you suspect (bank 1 pre-cat sensor reading high constantly for some time), then what?
what is wrong (change sensor?) and how to address?
dealer tech claims to have tried to swap the 2 pre cat sensors from side to side, and it remains bank 1 that keeps saying high voltage/rich...
Then one will have to figure out why that sensor reads high persistently.
1) check wires between bank 1 sensor and DME for shorts and continuity
2) check the postcat sensor and see that also reads high
Btw, I checked more and it seems your pre-cat sensors may be of the wide-band type, in which case the voltage won't be 0.3 to 0.7v. High voltage will mean lean (reverse of the traditional narrow band sensor). If that's true, you can log O2 sensing instead which will fluctuate a bit around 1.00.
First thing first. We should verify what the dealer said is indeed what you see on Duramatric.
