2005 Nissan Xterra P1283 A/F Sensor

2005 Nissan Xterra

Nissan Xterra

On the 2005 Nissan Xterra, the P1283 is pointing to a problem with the A/F Sensor for Bank-2. An air fuel ratio (A/F) sensor measures oxygen content of the exhaust in a wider range. The A/F sensor is very similar in design and function as an Oxygen Sensor, just ‘smarter’ to accommodate the advanced emissions systems. The job of the A/F sensor is to measure the oxygen content in the exhaust and send this information to the engine on-board computer. Based on air fuel ratio sensor signal, the computer adjusts the air to fuel ratio to keep it at the best level for fuel economy and engine performance. There are a few things that can set this code. First, check for intake air leaks. With the engine running, carefully and sparingly spray some throttle cleaner around the base of the intake. If the engine responds, this is a sign of a leak and the intake gasket will need to be replaced (make sure to visual inspect the manifold itself for any cracks at this time as well). If no leaks are found, check fuel pressure. Correct fuel pressure for this vehicle is 51psi at idle. If fuel pressure checks ok, suspect the A/F Sensor for Bank-2 has failed. The sensor is mounted to the exhaust on the driver’s side, before the converter. Best access will be through the driver’s side front wheel well, with the fender liner removed.

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