2008 Cadillac CTS 3.6L with engine codes P2190 and P2188

Question

Vehicle is currently have this DTC. All data parameters as seen with scan tool were at correct specs. Vehicle does not have any unusual engine performance concern like misfires, hesitation, engine stalling or a reduced engine power. Several parts related to fuel system has been changed. No intake air leak or even evap system leak was found. Anymore suggestions from you guys?

Answer 1

The P2190 code indicates that the air/fuel mixture ratio is too rich, meaning more fuel and air. Several things can set the P2190 code, you could start by checking the air filter and the Mass Air Flow (MAF) for debris obstructing the airflow to the engine. If the air filter and MAF are OK, the next step is checking for fuel component leaks.

P2190 Chevrolet Code - Fuel Trim System Rich At Idle Bank 2
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