Help --Toyota Corolla - P0171 System too lean (BANK 1) - Toyota Nation Forum : Toyota Car and Truck Forums
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#1 Old 11-12-2004, 01:06 PM
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USA ???Help --Toyota Corolla - P0171 System too lean (BANK 1)

Hi,

I changed my Air-Filter myself and after that Check Engine Alert started coming ..

I diagnosed myself and by local service.. both gave P0171 code ..

What can go wrong .. as per other thread It is O2 SENSOR..

How do I know that O2 SENSOR is bad...

I will appreciate your help ...
Thanks
RNK

It is 2000 LE

Last edited by rnk11; 11-12-2004 at 01:57 PM.
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#2 Old 11-12-2004, 01:40 PM
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Anybody ???
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#3 Old 01-17-2005, 06:06 PM
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Clean the MAF sensor, it did the trick for me. search the forum for "P0171" you will see my post.


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