Hi, I have, 2001 Nissan Maxima. Get check engine lite. Car now has 60k miles. Local mechanic had already replaced two O2 sensors 9 months ago. I don't know what the codes were at that time. Check Engine Lite still comes on with code of p0101 (fuel too lean). This happened after driving car 2 hrs on the highway. There are no fume leaks in the system. I just took it back today to have it check again. Mechanic says Bank 1 of the 02 sensors is spiking on his monitor, Bank 2 is ok. What are my options. Thank you

LEAN FUEL SYSTEM POSSIBLE CAUSE. WEAK FUEL PUMP, DIRTY CLOGGED INJECTORS.LOOK FOR INTAKE LEAKS AND EXHAUST LEAKS. REPLACE FUEL FILTER.CHECK FUEL PRESSURE. SHOULD BE 34 PSI. CHECK FUEL PRESSURE MAKE SURE ITS OKAY BEFORE BUYING NEW MAF SENSOR.THEY ARE EXPENSIVE. LEAN FUEL SYSTEM POSSIBLE CAUSE. WEAK FUEL PUMP, DIRTY CLOGGED INJECTORS.LOOK FOR INTAKE LEAKS AND EXHAUST LEAKS. REPLACE FUEL FILTER.CHECK FUEL PRESSURE. SHOULD BE 34 PSI. CHECK FUEL PRESSURE MAKE SURE ITS OKAY BEFORE BUYING NEW MAF SENSOR.THEY ARE EXPENSIVE.

The O2 sensors are new and the Mechanic says they are ok. Do you have any other options?
ie, 1) would the cars computer need to be re-programmed or 2) would I need a new catalyic converter or 3) take car back to a Nissan mechanic

Thanks The O2 sensors are new and the Mechanic says they are ok. Do you have any other options? ie, 1) would the cars computer need to be re-programmed or 2) would I need a new catalyic converter or 3) take car back to a Nissan mechanic Thanks

no cat should be ok at this low mileage ,check the wires to the sensors as if mechanic fitted universals then he would have cut wires and joined them, up and the connection has come loose ?? ,ON the wiring to the sensor are two wires trhe same colour normally white ,disconnect them and then put a meter across and check for 12v ,then use meter on continuety and check the same two wires on the sensor for continuety first and see what happens if they are spiking then their faulty ?well i would have thought so ,or try swopping them from one side to the other side and see if the problem is still on the same bank or if its reversed ?? no cat should be ok at this low mileage ,check the wires to the sensors as if mechanic fitted universals then he would have cut wires and joined them, up and the connection has come loose ?? ,ON the wiring to the sensor are two wires trhe same colour normally white ,disconnect them and then put a meter across and check for 12v ,then use meter on continuety and check the same two wires on the sensor for continuety first and see what happens if they are spiking then their faulty ?well i would have thought so ,or try swopping them from one side to the other side and see if the problem is still on the same bank or if its reversed ??