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Trouble code p1131 indicates that the powertrain control module has detected a lean condition in engine bank no. 1. This could be because of a faulty O2 sensor or a damaged vacuum line. It is advisable to start by checking and replacing the O2 sensor, as they are generally easy to locate and swap out. If the O2 sensor is not the issue, the next step would be to inspect the vacuum line for cracks or loose seals. If these checks do not resolve the problem, further investigation into the fuel injector and starter is recommended. These components are more challenging to access, so it's better to address them after eliminating other possibilities. Resolving this problem should eliminate the trouble code.
I want to learn more about error codes P1132 and P1131.
The trouble code P1131 indicates that the engine's first bank is running too lean, as detected by the powertrain control module. This code may be activated by issues such as a vacuum leak, fuel injector problem, ignition problem, or faulty oxygen sensor.