Puzzle: "Normal Fuel Trim" but got DTC 0170 and CEL is ON. Anyone ???
03-18-2015, 02:38 PM
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1997 c230
Puzzle: "Normal Fuel Trim" but got DTC 0170 and CEL is ON. Anyone ???
I have 1997 C230. It's been great with this car for 18 years and over 275k miles.
Recently the Check Engine Light (CEL) turned ON and I got the DTC code P0170, which is the error code for fuel trim bank 1. My OBD II readers displays the following STFT and LTFT numbers.
STFT B1 (%) 0.8
LTFT B1 (%) -0.8
Apparently, the number looks normal. And the car runs great.
But then why the CEL is ON and the error code? Any idea?
Thanks.
Mike
Recently the Check Engine Light (CEL) turned ON and I got the DTC code P0170, which is the error code for fuel trim bank 1. My OBD II readers displays the following STFT and LTFT numbers.
STFT B1 (%) 0.8
LTFT B1 (%) -0.8
Apparently, the number looks normal. And the car runs great.
But then why the CEL is ON and the error code? Any idea?
Thanks.
Mike
03-26-2015, 04:46 PM
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Thanks you for your suggestion. I checked the fuel pressure regulator and purge valve but it seems they are working fine.
Regarding the O2 sensor, can it go wrong without triggering a DTC code?
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