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P2189 is a diagnostic trouble code (DTC) for "Sys Too Lean at Idle Bank 2". 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 for gasoline engines that we modernly know is 14.7:1. The engine control module (ECM) is programmed to adjust things like fuel delivery and ignition timing if needed to keep the air-fuel ratio at or near the 14.7:1 ratio. Trouble code P2189 indicates that the ECM has determined that there is too much air and too little fuel present in the air-fuel ratio during engine idle.
This code indicates that during the last two drive cycles, the ECM has observed a lean air-fuel ratio condition on bank 2 of the engine. The manufacture designed the ECM with the ability to adjust the air-fuel ratio by changing the ignition timing and fuel injection pulse width to help achieve 14.7:1. The ECM can only adjust the air-fuel ratio to a certain extent. If the margin of adjustment is too wide for the ECM to correct the lean condition, then a code P2189 will set.
Often times, a mechanic may not check the vacuum lines and EVAP system of the vehicle. The EVAP system and vacuum lines are among one of the most likely things to cause a lean condition.
It is fairly serious because an improper air-fuel ratio will generate excessive emissions, which will cause harm to the environment.
As there are many components which can cause this code, it is recommended to have an experienced technician point out the faulted component through proper testing and inspection to save 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.