Diesel engines, especially older ones, often don't use O2 sensors in the same way gasoline engines do. They might have one or more sensors for monitoring exhaust gas, but their location and purpose is different. They're typically involved in emissions monitoring rather than directly controlling the air/fuel mixture like in a gasoline engine.
To find the location of your O2 sensor(s), you need to:
1. Identify your engine: Check your vehicle's documentation or the engine block itself to determine the exact engine type and code.
2. Consult a repair manual: A repair manual specific to your year, make, model, and engine will have diagrams showing the location of all sensors, including any O2 sensors or equivalent exhaust gas monitoring sensors. This is the most reliable source.
3. Use an online parts diagram: Many auto parts websites (like AutoZone, Advance Auto Parts, Napa Auto Parts) allow you to look up your vehicle and see diagrams showing sensor locations. However, these diagrams might not be as detailed as a repair manual.
Important Note: Working on the exhaust system can be dangerous due to heat and potential exposure to harmful gases. If you're not comfortable performing this task yourself, it's best to take your vehicle to a qualified mechanic.
