Buick Terraza P0505: Idle Air Control System- Malfunction

P0505 is an OBDII code that deals with the idle air control system in the Buick Terraza.  It’s a generic code, which means that it has the same meaning for the Terraza as it would any other vehicle (Terraza or not). P0505:  Idle Air Control System:  Malfunction When P0505 is triggered, it is typically caused … Read more

Buick Terraza P0402: EGR → Excessive Flow Diagnosis

  P0402 is an OBDII trouble code that’ll pop up in the Buick Terraza. It has to do with the emissions system and stands for: P0402: EGR → Excessive Flow Diagnosis The EGR system on a vehicle is responsible for recirculating exhaust gasses in order to lower the vehicles emissions output. The amount of gas … Read more

Buick Terraza P0140: O2 Sensor → No Activity Detected B1S2

P0140 is a generic OBDII trouble code. It has the same meaning for any vehicle with OBDII, including the Buick Terraza. It means that the PCM/ECM is not detecting any activity from the sensor.  It doesn’t mean that the O2 sensor isn’t getting power, but that the voltage isn’t changing, which is the “no activity”. … Read more