Rick's Free Auto Repair Advice

Posts Tagged: O2 sensor

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

Backprobe an electrical connector

How to backprobe an electrical connector and test an electrical circuit When you’re checking live voltage readings on sensors, the challenge is How to backprobe an electrical connector. Some pros stick a pin through the wire. But these piercing claws from Ferret make the job much easier. Isolate the wire carrying the signal you want to monitor. Then position the wire in the cradle of the “claw.” Screw the piercing probe into the wire and then attach the lead from your digital multi-meter into the end of the Ferret Claw. … Read More

P0133 Dodge

Fix a P0133 Dodge oxygen sensor code Got a P0133 Dodge oxygen sensor code along with possible P0171 P0555 codes? The read this. It applies to 1999-2001 Dodge truck with the 4.7 engine and you find the following trouble codes: P0171 P0555 The scoop on trouble codes P0133 P0171 P0555 P0133 Oxygen sensor slow response, P10171 fuel system lean, and P0555 power steering switch failure, Don’t jump to the conclusion that a P0133 Dodge oxygen sensor code automatically means you need a new oxygen sensor. In face, if you have … Read More

Test and replace an O2 Sensor

How to replace an O2 sensor Most people automatically assume an O2 sensor trouble code means they should replace the oxygen sensor. They immediately want to know how to replace an oxygen sensor. However, if you jump to that conclusion without actually testing the sensor, you could be wasting your money. Take a minute to understand how an O2 sensor works and how they go bad. What causes an O2 sensor trouble code? Oxygen sensor trouble codes start with P0130 and go up to P0167. Newer style air/fuel ratio sensors … Read More


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