2001 Nissan Maxima 3.5L with engine code P1284, what is the problem?

Question

P1284 on my 2001 Nissan Maxima 3.5L b1 stft .78, b1 ltft -100, b2 stft and ltft -100. what is the problem

Answer 1

P1284 indicates a problem with bank 1 O2 sensor 1. This is in the exhaust manifold on the bank closest to the firewall.It is affecting the bank 1 short term fuel trim. Replace the sensor and that will normally resolve the issue. Also, check for any exhaust leaks.

Answer 2

P1284 NISSAN - Air Fuel Ratio Sensor 1 Rich Shift Monitoring Bank 2

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