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Ron Z.
Ron Z., - Chevy Tech -
Category: Chevy
Satisfied Customers: 18775
Experience:  18+yrs experience. State Inspector and Chevy Diagnostics
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2003 Chevrolet Suburban 1500: I was told that the O2 sensor was

Resolved Question:

I was told that the O2 sensor was bad on my 2003 Chevrolet Suburban 1500. I have seen write ups related to anywhere from 1-4 sensors on this vehicle. Question 1: How many are on the truck, Question 2: Where is it, Question 3: How do you switch it out and, Question 4: Will the chack engine light automatically go out or does it require a reset?
Submitted: 7 years ago.
Category: Chevy
Expert:  Ron Z. replied 7 years ago.
Can you just give me engine size? If unknown, the 8th digit of the VIN# XXXXX do.
Customer: replied 7 years ago.
Not sure 8th digit is a "Z" Vortec
Expert:  Ron Z. replied 7 years ago.

Just so you will know, the "Z" code is a 5.3 Flex Fuel V8 engine. Now to your question....


1. There are 4 oxygen sensors on this truck.

2. All 4 are screwed into the exhaust pipes, see diagram for locations:


3. To swap them out, follow the electrical connector up, and unplug it, then simply unscrew the oxygen sensor.

4. The check engine will not go off by itself. You will either need to have a scan tool to shut t off, or disconnect the NEG battery cable for 5 min (be sure you have your radio code if you use this method!)

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