P2188 - SYSTEM TOO LEAN AT IDLE BANK 1

The P2188 OBDII diagnostic code relates to the value delivered by the Oxygen (O2) sensor located in the exhaust to the PCM (Powertrain Control Module). This information is relevant to control the amount of fuel injected into the engine.

The PCM uses the O2 Sensors to determine the amount of fuel needed for efficient engine operation. In case the required air/fuel mixture balance cannot be achieved, this code will be set.

• Check Engine light illumination.
• Occasional misfiring.
• The motor loses power.
• Higher fuel consumption.

Reasons for setting the P2188 OBD2 fault code:

• Exhaust system bank 1 may be leaking.
• The Oxygen (O2) sensor in bank 1 may be defective.
• Possibly, the Mass Air Flow (MAF) sensor is damaged.
• Poor fuel injector.

When the DTC P2188 OBDII code is set, you must do the following to correct it:

• Before starting with the diagnosis of the P2188 OBDII trouble code, you must check there are no other codes set. If that is the case, repair those codes and then fix the
• Consult the available Technical Service Bulletins (TSB).
• Check the O2 Sensor and MAF Sensor wires and connectors. Any damaged components should be repaired or replaced.
• Test the voltage signal from the MAF Sensor and the Oxygen Sensor. The results obtained should be compared with the manufacturer's specifications. Replace the sensor that does not meet specifications.
• Make sure there are no inlet leaks. Repair as needed.
• Check the fuel injectors are working properly. Replace any damaged injector.