Here's how to figure out which oxygen sensor to replace:
1. Diagnostic Trouble Codes (DTCs): This is the most reliable method. Use an OBD-II scanner (available at most auto parts stores) to read the trouble codes. The codes will pinpoint which oxygen sensor(s) are malfunctioning. The code will likely specify the bank (Bank 1 is usually the driver's side, Bank 2 is the passenger side) and sensor location (Sensor 1 is upstream, Sensor 2 is downstream).
2. Visual Inspection (Less Reliable): While less precise, a visual inspection can sometimes help. Look for:
* Obvious damage: Check for any cracks, broken wires, or corrosion on the sensor's wiring or connector.
* Sensor location: The upstream sensors are located closer to the engine, before the catalytic converters. The downstream sensors are after the catalytic converters, closer to the exhaust system's tailpipe.
Location of Oxygen Sensors (General):
* Upstream (Bank 1 - Driver's Side): This sensor is typically located in the exhaust manifold or near the engine's exhaust ports on the driver's side. You'll likely need to get under the vehicle to access it.
* Downstream (Bank 1 - Driver's Side): This sensor is located in the exhaust pipe after the catalytic converter on the driver's side.
* Upstream (Bank 2 - Passenger Side): Similar location to the Bank 1 upstream sensor, but on the passenger side of the engine.
* Downstream (Bank 2 - Passenger Side): Similar location to the Bank 1 downstream sensor, but on the passenger side of the engine.
Important Considerations:
* Repair Manual: A repair manual specific to your 2000 Dodge Dakota 4.7L engine is highly recommended. It will provide detailed diagrams showing the exact location of each sensor and instructions for replacement.
* Professional Help: If you're not comfortable working under your vehicle or are unsure about any step, take your Dakota to a qualified mechanic. Incorrectly replacing or diagnosing an oxygen sensor can lead to further damage.
In summary, get the trouble codes first. That's the only way to be sure which sensor needs replacing. Then, use a repair manual or consult a mechanic to locate and replace the faulty sensor.
