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Where is the o2 sensor on a 2003 Cadillac northstar engine?

The 2003 Cadillac Northstar engine typically has two oxygen sensors. Their exact location varies slightly depending on the specific Northstar variant (4.6L or 4.0L) and whether it's a front-wheel or all-wheel drive vehicle. However, they are generally located:

* Upstream (pre-catalytic converter): This sensor is located in the exhaust manifold, *before* the catalytic converter. It's usually closer to the engine.

* Downstream (post-catalytic converter): This sensor is located in the exhaust pipe, *after* the catalytic converter.

To find them precisely:

1. Consult your owner's manual: This is the best place to start. It should have diagrams showing the sensor locations.

2. Use a repair manual: A Haynes or Chilton manual for your specific Cadillac model and year will have detailed diagrams and instructions.

3. Use an online repair database: Sites like AllDataDIY (subscription required) or others offer detailed diagrams and repair information.

4. Look at online forums: Search forums specific to Cadillac Northstar engines (e.g., Cadillac Forums) – someone may have posted pictures of their sensor locations.

Important Note: Exhaust systems get very hot. Allow the engine to cool completely before attempting to locate or work on the oxygen sensors. Wear appropriate safety gear, including gloves.

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