Always consult the specific workshop manual for your Nissan model, as pinouts and connector locations vary.
Cracks in the exhaust manifold or a failed gasket allowing unmetered ambient air into the stream. nissan p155b00
An irregular battery internal resistance can fool the current sensor. Always consult the specific workshop manual for your
Locate the offending oxygen sensor along the exhaust piping. Unplug the harness and inspect it for signs of corrosion, bent pins, or liquid intrusion. It is highly common on older Nissan models for oil from a leaky filler neck or valve cover to drip down into the sensor harness [1.16], skewing voltage values. Use a can of electrical contact cleaner to clear any residue [1.16]. 2. Check for Exhaust Leaks Locate the offending oxygen sensor along the exhaust piping
Unplug the small wiring harness connector attached directly to the negative terminal current sensor.