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2008 Nissan Rouge P0146 Fault: O2 Sensor 3 Bank 1 Issue and ECU Suspicions

Model: 2008 Nissan Rouge Fault Code: P0146 Posted: 2015-11-14 09:41

I'm currently troubleshooting a 2008 Nissan Rouge S with a 2.5L four-cylinder engine. A diagnostic scan reveals a Malfunction Indicator Lamp (MIL) triggered by trouble code P0146 — indicating a fault in Bank 1 Sensor 3. I replaced the oxygen sensor, but the MIL reappeared after the replacement. Freeze frame data and live sensor readings show activity, suggesting the sensor is receiving signals. As a preventive measure, I've also replaced all other O2 sensors. Despite this, the vehicle runs smoothly with no noticeable performance issues — only the P0146 code persists. Given that the ECU appears to be functioning correctly in real-world operation, my suspicion now leans toward a potential fault or defect within the ECU itself. However, I'm seeking input from experienced users on this specific model and whether there are known patterns or solutions for P0146 in 2008 Nissan Rouge vehicles. Any insights or diagnostic tips would be greatly appreciated! Thanks, BRANDON aka 'valleyspeed1'

Related fault codes
P0146
Comments (3)
Anonymous 2015-11-14 09:46

By the way, I'm reading a steady 1.275 volts at the sensor with no fluctuation, regardless of throttle position. This voltage level seems unusually high — could this indicate a sensor issue or wiring problem? Any advice on what to check next?

Anonymous 2015-11-14 12:22

The post mentions 'all indicators point to a faulty or defective ECU.' Please refer to the trouble code section of this forum for detailed causes and solutions. Always verify circuit wiring, connectors, and electrical integrity — including proper voltage and resistance readings — as these are common root causes of P0146 in Nissan vehicles.

Anonymous 2015-11-14 13:25

This is a challenging diagnostic scenario. To proceed effectively: 1) Is the vehicle registered under California or federal emissions standards? 2) Were the replacement O2 sensors sourced from Nissan (original equipment)? 3) Confirm the exact location of Sensor 3 — this is critical as misidentification can lead to incorrect diagnostics. 4) Does the vehicle show any other active trouble codes? 5) Is the vehicle stock configuration, with no modifications or aftermarket parts installed? Answering these five questions will help direct us to the correct troubleshooting guide and technical specifications for this model.