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Discussion Starter #1
Hello all - error codes say that my O2 sensors (2010 Vantage V8 roadster - stick) are malfunctioning. I hear they do tend fo fail and to start by replacing the upstream sensors first. Mechanically the job doesn't look too difficult. But wondering if anyone has experience doing this. After the replacement does the computer automatically reset itself and clear the code? I am not able to pass emissions at this point because of the check engine light. Comments welcome please! Thank you.
 

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O2 sensors not working

Thanks Erwin! So I did replace the O2 sensors, cleared the code and it has not returned. BUT...now my ECM won't reset into the Ready to Test mode. I have been turned away at the DMV emissions center 3 times now. They tell me to complete the Drive Cycle to clear and reset the ECM so that it's ready for testing. I have complete the Drive Cycle 4 times now and it still won't go to the Ready Mode. Very frustrating! Any ideas? Thank you!
 

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O2 sensors not working

Hi Erwin - here in the U.S. we must pass emissions testing every two years. The ECM must be in the 'ready state' before the testing can be completed. It must meet certain conditions before the testing equipment can 'talk' to the ECM and check all the various engine/emissions conditions, like the Evap Cooler, A/C Refrigerant status, stuff like that. According to the emissions testing facility my ECM is not in that 'ready' state so that they can do proper testing. They tell me I must complete a 'drive cycle' in the car, which is supposed to clear the ECM and prepare it for testing, The drive cycle consists of driving the car at certain speeds and RPMs over a particular distance, typically between 50 and 70 miles. They say that sometimes you must complete the drive cycle several times to reset the ECM. I have driven the cycle 5 times now - over 400 times - and the ECM is still not 'ready'. Going to have to bite the bullet and take it to the repair shop. Oh well - I tried! Thanks -
 

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hey thanks for sharing.
So.... my trusty local british-centric repair shop told me that in extreme weather some of the sensors in the Vantage do now work properly and are not able to complete the necessary checks they need in order to clear the ECM and get it into the 'ready state' for emissions testing. In my case I live in the Phoenix area. At the time I was trying to pass the emissions test the daily temps were around 110F. The mechanic told me that the sensors really needed significantly lower outside temps in order work. So I spent the night in Flagstaff, where the overnight lows were in the '50's. I arose early and complete the drive cycle. Went to the emissions testing facility and voila', it the car passed! Now I have two years before I have to worry about it again!
 
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