ludwigshadow8

Terrano oxygen sensor failure

I have a 2003 Nissan Terrano with a diesel engine. I'm encountering an oxygen sensor heater failure, which is causing the check engine light to come on and higher fuel consumption. I suspect a defective cable or plug connection. Has anyone dealt with this before?

A 2003 Nissan Terrano with a diesel engine is experiencing an oxygen sensor heater failure, leading to a check engine light and increased fuel consumption. The suspected causes include a defective cable or plug connection. Testing the sensor with a multimeter or consulting a workshop for a diagnosis are suggested solutions, with the latter being recommended for efficiency.

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I also own a Terrano, though a different build year. A similar issue presented itself some time ago. The heater element within the oxygen sensor is responsible for bringing the sensor up to operating temperature quickly, especially during cold starts. A defective heater circuit will trigger the check engine light. Did you perform any sensor testing to confirm the faulty sensor?

Thanks for the quick reply. I haven't tested the sensor itself yet. Where exactly should I be probing with a multimeter to check the heater element, and what resistance value am I looking for?

While you can certainly test the resistance of the heater element by probing the appropriate pins on the sensor connector (consult your vehicle's wiring diagram for pin identification), my experience suggests a workshop diagnosis is more efficient. A scan tool can monitor the sensor's output in real-time. In my case, going to the workshop saved significant time.

Understood. I appreciate the insight. I'll take it to a shop. They have quoted me 95€ for the repair.

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NISSAN

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TERRANO