2004 GMC Yukon XL Denali Q&A
2004 GMC Yukon XL Denali Question: o2 sensors
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
after changing plugs, wires, battery, fuel filter, altenator checked ok, air filter. My problem still exists. check engine light was on and code was to replace o2 sensor, did that. Yukon shuts do...