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Cobb AccessPort EVO X how to Data log for Etunes

Old Jul 14, 2017, 07:30 AM
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The problem is when it throws these codes technically the front o2 sensor is not working so the car will be in open loops and runs a but leaner.
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Old Jul 15, 2017, 09:55 PM
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Originally Posted by khaled_hourani View Post
The problem is when it throws these codes technically the front o2 sensor is not working so the car will be in open loops and runs a but leaner.
These codes are for the rear o2 sensor, have you verified in logs that the fuel trims all 0 out or freeze when you get the codes?

The front o2 sensor is a narrow band sensor and not really worth much. If you are running "lean" in open loop (high or low load) you should really adjust the tune. If you're fuel trims during closed loop stayed within ~5% there should extremely minimal difference with the front o2 not working/open loop.

the engine should also only be operating in closed loop at low RPM/engine loads. Again being it is a narrow band sensor its not helpful to the ECU as soon as the tune calls for anything "richer" than ~.97 lambda which is still way to lean for mid/high load situations.

hope that helps, don't hesitate to post again if there is more to discuss
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