Rick's Free Auto Repair Advice

Posts Tagged: B1S2

Oxygen Sensor Location

Where is the oxygen sensor Located You’ve got an oxygen sensor code and the description says something like B1S2. What does it mean? What’s the oxygen sensor location? B1 means the sensor is located on the same bank of the engine that has the #1 cylinder. B2 is located on the opposite bank. S1 means the sensor is located BEFORE the catalytic converter S2 means the sensor is located AFTER the catalytic converter Just remember: An oxygen sensor code does NOT automatically mean you have a bad sensor. The sensor … Read More

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