On the 2005 Nissan Xterra, the P1283 is pointing to a problem with the A/F Sensor for Bank-2. 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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