p0430 cat efficiency, Help

I know by having the computer scanned that this code is pass side cat efficiency issue.. I hear its most likely the o2 sensor, possibly the cat itself. What are the chances its the cat.. If it wasnt for the cost factor Id just replace all 4 o2s and be done with it. Im also worried it may not be the O2 and be the cat itself. I heard to test the o2 sensors you get the vechicle up to op temp, and check milivoltage on the sensor wires and look for fluctuations between.02 and .08 I believe? There are 4 wires coming from the O2 which 2 of the 4 do I probe...... Also do I disconnect the sensor and probe in the harness or should I pierce the wire while its connected. Im hitting this project tomarrow morning along with a water pump so quick replys are appreciated. Its a 98 Tahoe 5.7. Thanks Tony

Reply to
Rokihora
Loading thread data ...

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.