How to resolve trouble code p2177?

1 Answers
Ashlyn
07/29/25 5:26pm
To address trouble code p2177, perform a vehicle maintenance service by replacing the fuel filter and air filter. Below are detailed explanations regarding trouble code p2177: 1. Definition: The P2177 trouble code refers to fuel trim, which means the Engine Control Unit (ECU) adjusts the fuel delivery by increasing or decreasing the injector pulse width to achieve the optimal air-fuel ratio (14.7:1 air to fuel mass ratio). A rich air-fuel mixture indicates excessive fuel delivery, while a lean mixture indicates insufficient fuel delivery. System too lean means the fuel quantity (relative to air intake) is too low. 2. Causes: Possible causes include air leaks downstream of the Mass Air Flow (MAF) sensor, PCV system leaks, faulty oxygen sensor, exhaust leaks near the oxygen sensor, EGR leaks, etc.
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