Helpful Automotive Resources
P2187 Code: System too Lean at Idle (Bank 1)In an internal combustion engine, the air-fuel mixture is controlled by the powertrain control module (PCM). The PCM uses a closed-loop air-fuel metering system and monitors the heated oxygen sensor signal voltage. It utilizes various data from the sensors in the car, such as the oxygen sensors, manifold absolute pressure P0109 Code: MAP / BARO Sensor Circuit IntermittentA MAP sensor is used to monitor engine load. Some vehicles may be equipped with a MAP sensor and a separate BARO sensor. A BARO sensor is similar to a MAP sensor, but it can detect more minute or subtle changes in atmospheric air pressure.
P012d Code: Turbo / Supercharger Inlet Pressure Sensor Circuit HighTurbochargers and superchargers increase the pressure in the intake manifold. This pulls additional air into the combustion chamber to help boost engine power. Both turbo and superchargers have an inlet where filtered air gets in. The vehicle’s powertrain control module (PCM) uses an inlet pressure sensor to monitor and regulate How to Check if Your MAP Sensor is BadIn other words, in order to secure the best combustion possible, the MAP sensor should operate with sharp precision. If it fails and starts feeding the PCM with erroneous signals, you can expect your air-fuel ratio to become either too lean (less fuel) or too rich (more fuel).