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I’m reaching out because I need help. I’m working on a 2011 Altima V6, with a P0171. We replaced the MAF, A/F sensor bank 1 sensor 1, injectors, checked fuel pressure and even smoked it to check for leaks. Everything is ok. With the car hooked to a scanner it reads ‘lean’ and doesn’t fluctuate between lean and rich like bank 2 does. The voltage for the bank 1 sensor 1 is at 1.89 volts at idle and I can make it go to 4 volts by racing the engine. Any ideas? I’m wondering if the ECM is faulty and is not processing the information from the sensor.
 
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