Rear Heated O2 Sensor for Nissan Vehicles

This rear oxygen sensor is a key emission-control spare part fitted after the catalytic converter. It’s needed to help the ECU confirm that the catalyst is cleaning the exhaust properly and to keep the car running within factory emissions limits ✅.

How This Sensor Works ⚙️

The sensing tip reads oxygen content in the exhaust stream, while the built-in heater quickly brings the element up to working temperature. Faster heat-up means faster closed-loop control, steadier readings, and better system monitoring during cold starts ?️.

Signs It’s Failing ?

• Check Engine Light with O2 heater or efficiency codes
• Failed emissions test / high tailpipe readings
• Rough idle or hesitation on warm-up
• Higher fuel use in some cases

What Happens If You Ignore a Bad One ❌

A broken rear sensor can misreport catalyst performance, triggering limp strategies, masking real exhaust issues, and causing repeat warning lights. Over time, it may lead to catalyst damage being missed and expensive repairs. Replacing it restores accurate exhaust feedback and smoother system operation ?.