Rick's Free Auto Repair Advice

Posts Tagged: Bank 1

P0171 trouble code

P0171 trouble code System too lean (Bank 1) If you have a P0171 trouble code System too lean (Bank 1) trouble code, read this to understand what it means Lean codes are incredibly difficult to diagnose. And it’s one trouble code where you don’t want to start throwing parts at the problem. The guys at the parts store will tell you to replace the Oxygen sensor. Nice guess, but probably wrong. They’re assuming that the fuel mixture is correct but the sensor is reporting it wrong. Oxygen sensors DO wear … Read More

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