p0171 fault code on my toyota platz - Toyota Nation Forum : Toyota Car and Truck Forums


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Old 03-03-2010, 06:15 AM   #1 (permalink)
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European Union p0171 fault code on my toyota platz

hello there i'm new to this forum i do work as a mechanic but on older version cars that had carburettors,my problem is that my son got this toyota platz which has a fault on dasboard i diagnose with code reader and found it was p0171 code i renewed the fuel filter,replaced also the air flow sensor,but still on going uphill it show again then i switch off the car and shows again always going uphill can someone help.
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Old 09-23-2010, 05:44 PM   #2 (permalink)
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P0171 uphill

Hi I had the same problem with the engine light coming on when going uphill, code P0171. I tried several things, cleaned the MAF, changed the air filter and spark plug but the problem was still there. I took it to a garage and they changed the oxygen sensor, checked for vacuum leaks, fuel pressure, bad earth to the MAF, adjusted the hot idle but the problem was still there. In the end I clean the MAF again and noted that there was a bit of play in the air filter housing. On one of the front bolts holding the air filter housing the rubber washer had been compressed and was not holding the corner of the filter housing firm. I put an extra rubber washer under the bolt to remove the play and the problem seems to be fixed. I have tested it for about 2 week with no sight of the light, prior to this the light came on daily. Hope this is of some help.
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