How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Ron Z. Your Own Question
Ron Z.
Ron Z., - Chevy Tech -
Category: Chevy
Satisfied Customers: 17797
Experience:  18+yrs experience. State Inspector and Chevy Diagnostics
Type Your Chevy Question Here...
Ron Z. is online now
A new question is answered every 9 seconds

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!)

Ron Z. and other Chevy Specialists are ready to help you

Related Chevy Questions