2002 Hyundai XG350 Q&A
2002 Hyundai XG350 Question: Where is the rear O2 sensor located?
Got a P0141 OBDII code, which the hmaservice.com site says is a "rear oxygen sensor heater circuit malfunction". Where exactly is this sensor located? If it's reasonably accessible, I'll replace it this afternoon, otherwise I'll have to camp out on the dealer's doorstep tomorrow morning. - PhobeAnn
Oxygen sensors are identified by bank and sensor position. Sensor 1 is always pre catalytic converter, sensor two is always post catalytic converter. If an engine is a 4 or 6 cylinder engine the whole engine is considered bank 1, if an engine is a V6, V8, V10....., the engine bank containing cylinder number 1 (first cylinder in the firing order) is considered Bank 1, the other bank is considered Bank 2. Interpretation Oxygen sensor designation B2S1 refers to Bank 2 Sensor 1, it will be the sensor on the engine side of the catalytic converter in bank two. Check this link to determine the cylinder that contains cylinder number 1. http://www.wellsve.com/custom_searches/ds_firing.php - patrick mannion