Where is the oxygen sensor on a 2004 Chevy Suburban?

The location of the oxygen sensor(s) on a 2004 Chevy Suburban depends on the engine type (4.8L, 5.3L, or 6.0L). There are typically multiple oxygen sensors: upstream (before the catalytic converter) and downstream (after the catalytic converter).

To find them, you'll need to:

1. Consult your vehicle's repair manual: This is the most reliable source. The manual will have diagrams showing the exact locations of all the sensors.

2. Use a repair database: Sites like AllDataDIY or Mitchell 1 (subscription required) provide detailed diagrams and repair information.

3. Look online for a specific engine diagram: Search for "2004 Chevy Suburban [engine size] oxygen sensor location." Many forums and websites have pictures and descriptions that could help.

General locations (but not guaranteed): The upstream sensors are usually located in the exhaust manifold or close to it. Downstream sensors are typically located after the catalytic converter in the exhaust pipe. They're usually threaded into the exhaust components.

Important Note: Oxygen sensors are usually located in hot areas of the exhaust system. Be careful when working near them, as they can be very hot even after the engine has been off for a while. Always allow sufficient cooling time before working on them.