2017 Subaru WRX
Mileage
144,721
Service Date
7/23/2021
Services Performed
- Found fault in history: P2097 – rear O2 sensor, rich. Monitored O2 sensor data – with engine at full operating temp rear sensor stays at .8v regardless of engine speed, front sensor (AF sensor) stays between 1.01v and 1.03v indicating a faulty front sensor. Fuel pressure tests okay, mass air and intake air temp within spec. Re-checked wiring for O2 sensors – all okay. Rear sensor seems to be functioning as designed indicating catalytic converter is operating as designed. Noticed high engine vacuum during a hot idle. Suspect front sensor is failing and possible PCV issue. Replaced front A/F sensor. Cleared fault and road tested while monitoring sensor data. Both sensors are now reading correctly and no faults set. Put over 45mi on test drives, no fault code returned.
- Changed engine oil and filter – used 4.5L 5w30 synthetic. **Level was correct before draining**
Genevieve G. gave our service a 5 star review on 7/23/2021
