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12-26-2018, 10:09 AM | #1 |
P0171 Error Code
Hello everybody,
I have a problem with my 2001 Yaris (Made in Japan). When i'm running on the highway the CEL came ON with a P0171 code. I have made a lot of research and i + the toyota dealer haven't found the answer. The code appears only on the highway. I have some symptoms -> Increasing of fuel consumption, sometimes engine hesitation with power loss. I have cleaned the MAF sensor, Replaced the lambda sensor after the cat (Toyota said that the first one is ok). I have checked for leaks but i have not disassemble the intake manifold. I have purchased a Delphi OBD reader and i have checked the values between my 2 yaris. The Engine load is weird around 30% at idle but the MAF values are identical on the 2 cars. Long term fuel trim is around 20%. At 80kmh the first O2 sensor oscillate between 0,8 and 0,2v - The second is around 0,7v. I have checked my spark plugs which are pretty white, so i'm assuming that the engine is really running lean. but if i'm not wrong, this is not coherent with the lambda values. The first cylinder and coil is really dirty around the spark plug like if the spark plug was leaking ? This car made a lot of highway (70 000km at 130kmh) and overheated once. The car has 165 000km on it. So now i am asking if : - Bad Fuel Pump ? - Air Leak ? - TPS sensor due to the weir engine load ? I don't really know what i should change or if i stop now, considering that toyota charge me 500 bucks for the diagnostic and O2 sensor with no results. Any advice will be well welcome Thank you ! |
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