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After Cat fuel trim Error After Cat fuel trim Error
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Old 07-08-2015, 11:19 AM
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After Cat fuel trim Error
I have an E53 / M54. I just changed pre and post O2 sensors for # 4 -6 bank. I did not get wires crossed. Error E2 came on. Can anybody please help? Thanks!
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Old 07-10-2015, 03:04 PM
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Pre & Post CAT O2 Sensors
I have an E53 / M54. I just changed pre and post O2 sensors for # 4 -6 bank. I did not get wires crossed. Error E2 came on. Can anybody please help? Thanks!

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Old 07-10-2015, 04:20 PM
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Thanks trader4 -

I have a BavAuto code reader and code E2 from table 19 says, "After CAT Fuel Trim".
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Old 07-10-2015, 05:57 PM
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What O2 sensors did you use?
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Old 07-10-2015, 06:02 PM
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Could it mean "after cat O2 sensor trim"?
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Old 07-10-2015, 06:27 PM
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Old 07-10-2015, 11:40 PM
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Quote:
Originally Posted by Yugo View Post
I have an E53 / M54. I just changed pre and post O2 sensors for # 4 -6 bank. I did not get wires crossed. Error E2 came on. Can anybody please help? Thanks!

Did you have the E2 code or any other before you changed the sensors?
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Old 07-11-2015, 09:17 AM
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Could be the efficiency of the cat for that bank. The post cat 02 sensor doesn't control fuel trim like pre cat 02 sensors. One simple test to perform is if you have an infrared thermometer is to drive the car until the temp is up and use the infrared thermometer to measure the temp at the inlet of the cat and at the outlet of the cat. The outlet temp should be greater then the inlet temp if the cat is working properly.
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Old 07-11-2015, 10:05 AM
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Suspect couple of things going on - simple code reader converts and groups 4 digit codes to 2 digit. Some fidelity is lost there...

New part can be defective, someone else's return, or just plain counterfeit. Glad at least it's a name brand sensor

As pall night suggested, it could be a bigger problem that replacing O2 sensor didn't fix.
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Old 07-13-2015, 06:05 PM
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I was getting these errors on my BavAuto code reader:
E2 - After Catalytic Converter #4-6
EC - Pre Cat Fuel Trim System #4 - 6
8F - DM-TL Leak Detected
F2 - Misfire Cylinder #5

I replaced both the Pre and Post Cat O2 Sensors w/Bosch.
They are the correct ones. P/N's 15109 for Post and 13477 for Pre.

After i replaced all of the above codes went away BUT, code E2.

Any of this make more sense?

Thanks!
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