Service Engine Light

[sphillips]

I have a 2000 Tahoe Z71 5.7L OBS with a P0420 code. Scanner says it is a catalyst issue. I have two catalysts, one with an O2 sensor on the engine side of the catalyst, the other with an O2 sensor on the muffler side of the other catalyst. Any thoughts on which catalyst, or could it be one of the O2 sensors. Hate to start swapping parts without some direction. Vehicle starts and runs fine.

 

[autoexpert]

I have a 2000 Tahoe Z71 5.7L OBS with a P0420 code. Scanner says it is a catalyst issue. I have two catalysts, one with an O2 sensor on the engine side of the catalyst, the other with an O2 sensor on the muffler side of the other catalyst. Any thoughts on which catalyst, or could it be one of the O2 sensors. Hate to start swapping parts without some direction. Vehicle starts and runs fine.

I'm sure it has occurred to everyone at one point, you are driving along the road, and this yellowish light "Service Engine Soon" occurs. So what exactly should you do when this occurs?
The Service Engine Soon Light is actually an on board alert light which is mounted on the vehicles computer. Whenever the computer system identifies a disconnected component in the engine, it lights up the Service Engine Soon Light to make certain you are aware of the problem. Usually people instantly head out and pay $100 or more to get their car fixed and get the Service Engine Soon deactivated, simply to discover it was a fairly snap service work. So before you drop a ton of cash on repairs, there are a few things you will prefer to check...

http://checkenginecode.com/Service_Engine_Soon.html

 

[rockenthebowtie]

P0420 catalyst system low efficiently bank 1.. thats going to be the one thats bolted on the DRIVERS side exhaust manifold