Timeline for 2002 VW GTI 1.8T - O2 sensor fault code only when exceeding 70mph
Current License: CC BY-SA 3.0
8 events
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| Sep 22, 2016 at 12:06 | comment | added | AnyOneElse | It might be increased resistance due to heat... I did a few measurements on the 1.8T (Ibiza Cupra, but similar engine) during phases of heavy load (accelerating quickly or at steep hills or from low rpm) the temperature of exhaust rises very quickly. If your sensor is rather old it might have drifted in the higher temp regions. If accelerating smoothly lower temperature is expected at 70mph. Usually in the software the MIL state is saved like: was happening, not active any more... | |
| Dec 26, 2015 at 20:30 | history | edited | DucatiKiller | CC BY-SA 3.0 |
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| Dec 26, 2015 at 20:11 | history | edited | Fred Wilson | CC BY-SA 3.0 |
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| Dec 25, 2015 at 21:02 | comment | added | Fred Wilson | @juhist See an added part to the answer about how onboard tests can show odd behavior. I see so much of this in the early OBD11 systems I don't consider it unusual. If by intermittent you mean when the MIL goes on and off, post it as a question and I and others will give our best answers. | |
| Dec 25, 2015 at 20:16 | history | edited | Fred Wilson | CC BY-SA 3.0 |
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| Dec 25, 2015 at 18:06 | comment | added | juhist | I have second thoughts about this answer. Can you explain why the MIL automatically turns off after 1-2 days while staying below 70mph? Surely, the regulations wouldn't allow the MIL to turn automatically off and remain off if the driver chooses to drive only below 70mph. It seems to me that if the MIL turns off automatically, some tests are made indicating the sensor is working (because of the low exhaust gas temperature). If no tests are made, the system should remember the result of the last >70mph test, which indicated the sensor is faulty. And can you explain the "intermittent" code? | |
| Dec 25, 2015 at 17:44 | comment | added | juhist | Ah, I didn't even consider this. Same failure cause, but different explanation for the sensor failure being detected above 70mph. Your explanation makes sense. | |
| Dec 25, 2015 at 17:35 | history | answered | Fred Wilson | CC BY-SA 3.0 |