Replace the 02 sensors. 2 of the codes are 02 sensor malfunctions and 2 codes are because the system is too lean in both banks 1 and 2.
SOURCE: p0141 code
bank 1 sensor 2 that means the side where cylinder #1 is the second sensor so it is by the cat or after
SOURCE: My name is Shawn and
P0171 means Fuel Trim System Lean (Bank 1)
The MAF (Mass Air Flow) Sensor is dirty or faulty.
Note: The use of
"oiled" air filters (K&N, etc.) can cause the MAF to become dirty
if the filter is over-oiled
There could be a vacuum leak downstream of the MAF sensor.
If your FT is leaning it that much, I would
suspect an O2 sensor or it's circuit is the problem. When that O2
sensor went to 2V, I think you found your problem. The O2S is telling
the PCM that the fuel ratio is way rich, so the PCM is assigning a way
lean fuel trim.
Replacing the Mass Air Flow Sensor should do the trick.
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SOURCE: engine light is on ,code P0171, hesitates when start driving
If you have had a bad enough problem with the fuel filter, and it is not the fuel pump I would have to say it is the injectors. If your car is fuel injected there could be dirt in the injectors in which case they will need to be replaced. The problem is you can flush the whole fuel system except for the fuel injectors themselves. Though I am not sure how to check them myself, a mechanic could tell you if this is the problem in minutes. I cant say for sure if this is your problem but I have a 79 corrolla and it is doing the same thing and since I have replaced almost the whole fuel line except for the injectors themselves this is what I am leaning towards. Good luck!
SOURCE: I have a2001 corolla with a code p1071.I was told
This is almost always caused by a failing mass air flow sensor. If you had it replaced with aftermarket you may want to replace with oem to avoild problems. Thanks P0171 Fuel System Too Lean (Bank 1)Possible Causes Setting Conditions Base engine "mechanical" fault affecting one or more cylinders Check for air leaks after the MAF sensor Check for air leaks in the Air Induction system (e.g., in the intake manifold) Check for air leaks in the exhaust manifold and in the exhaust pipes Exhaust leaks located in front of the AFS or HO2S location Fuel control sensor is out of calibration (e.g., ECT, IAT or MAP) Fuel delivery system supplying too little fuel during cruise or idle periods (e.g., faulty fuel pump or dirty, restricted fuel filter) Fuel injector (one or more) dirty or pressure regulator has failed HO2S has failed (it may be contaminated with fuel, silicone or water) Vehicle driven low on fuel or until it ran out of fuel
SOURCE: both of my air fuel sensors are out on my
the two sensors alone will cost 300-400 bucks! The good news is the sensors are both in the intake line which should be easy to get to which saves on labor. They are billing 2-3 hrs at technicians labor rates to cover changing things out.
Overall, if this is a dealer, you are doing ok.
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