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What is your question?
What part of the engine that cause P0171 System too Lean (bank 1) error?
2 Replies
this is after the air-fuel feedback is stable after the engine warming up, the fuel trim is in error on the rich side. It takes 2 cycles for the engine to determine this fault. The next step in the diagnosis would be check for the following: gas leakage on the exhaust system check the fuel line pressure injector blockage heated o2 sensor in bank 1 sensor 1 malfunction manifold pressure sensor engine coolant temp. sensor. Check these items next to get the correct fix for the car. Thanks for your question and I hope it was a helpful answer.
Check it also for intake manifold leak or if it has a disconnected vacuum hose. Zee