* Two upstream: Located in the exhaust manifold, before the catalytic converter(s). One for each bank of cylinders (V8 has two banks).
* Two downstream: Located in the exhaust after the catalytic converter(s). One for each bank of cylinders.
However, there's a caveat: The exact number and placement *could* vary slightly depending on the year of manufacture and specific emission control configuration of your particular truck. Some configurations might have additional sensors for enhanced emissions monitoring.
To be absolutely certain, you should:
1. Consult your owner's manual: This is the most reliable source of information for your specific vehicle.
2. Check a repair manual specific to your year and model: Chilton's, Haynes, or a factory service manual will provide detailed diagrams showing the sensor locations.
3. Visually inspect your exhaust system: Locate the catalytic converter(s) and look upstream and downstream for the sensors. They typically have a wire harness connected to them.
Don't rely solely on online resources as the specific configuration might vary. Always use the manufacturer's information as the definitive guide.
