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Please explain fault code 1-2-1?

posted by  pgao on  Sun Mar 10 14:48 CST 2002
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last visit: Fri Dec 27 08:18 CST 2013
[RELATED]

Thanks for your response. I cleared the fault codes (both 435 and 121) without changing O2 sensor. If the check engine light comes back on, I will have the sensor replaced.

Since I have no idea what the MAF sensor is for and of course don't know where it locates, I appreciate if you could describe in detail where it is. Thanks in advance.





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