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P2188 is a diagnostic trouble code (DTC) for "System Too Lean at Idle Bank 1". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The most environmentally friendly and power efficient air-fuel ratio is 14.7:1. The engine control module (ECM) is able to adjust the air-fuel ratio in limited increments if it defers from the 14.7:1 range. The P2188 “System Too Lean at Idle Bank 1” definition indicates that there is too much air and too little fuel in the air-fuel ratio detected by the ECM during engine idle.
This particular trouble code means that a lean condition has been detected on bank 1 of the engine during idle. The ECM will attempt to correct the air-fuel ratio if the mixture becomes too lean.
The ECM will adjust fuel injector pulse width and ignition timing to alter the air-fuel ratio. If the lean condition is so excessive that the ECM can not bring the air-fuel ratio back to the desired range of 14.7:1, then a code P2188 sets.
Commonly, a worn vacuum line or EVAP leak will cause this code. However, multiple mechanics have overlooked this simple fix. It is important to thoroughly inspect the vacuum lines and the EVAP system if this trouble code is encountered.
As there are many components which could cause the exact same code, if a failure is recognized, it is recommended to have an experienced technician highlight the faulted component(s) through proper testing and inspection to save both time and money.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.