I have been monitoring my 2002 Frontier 2.4L SES light for 3 months now. It seems to come on evrey 150 miles or so, but after about 200 miles and several starts it turns off by itself. The engine runs great and I have achieved 27-28 mpg consistently.
Just to see if there are any codes in the computer, I had it scanned at Auto Zone and the code P0402 is still in the computer, even with the SES light off.
I had it scanned 2 months ago and that same code came up. It means EGR flow is excessive. I inspected visually the EGR components and saw 3 small vacuum hoses to EGR valve, Transducer, and solenoid were cracked and deteriorated; I replaced them, but apparently the code is still in and the SES comes on and goes off. Is there anything possibly wrong with the software in the computer?
This is the second Nissan that I have problems with the SES. The 1997 Sentra I used to have (before my daughter totalled it) had a code saying the rear O2 sensor was bad. I changed it, reset the light, but still kept coming on every 200 miles. I then changed the front O2 sensor, and the same thing happened.
I thought the catalytic converter must have been bad, then, and changed that too, but still no joy. In the end, I just pulled the CEL bulb out, since the engine, ran always great otherwise.
Is there something congenitally wrong with these Nissan engine computers that throw codes with no real problems?
Just wandering......:thatswck:
Val Barone
Just to see if there are any codes in the computer, I had it scanned at Auto Zone and the code P0402 is still in the computer, even with the SES light off.
I had it scanned 2 months ago and that same code came up. It means EGR flow is excessive. I inspected visually the EGR components and saw 3 small vacuum hoses to EGR valve, Transducer, and solenoid were cracked and deteriorated; I replaced them, but apparently the code is still in and the SES comes on and goes off. Is there anything possibly wrong with the software in the computer?
This is the second Nissan that I have problems with the SES. The 1997 Sentra I used to have (before my daughter totalled it) had a code saying the rear O2 sensor was bad. I changed it, reset the light, but still kept coming on every 200 miles. I then changed the front O2 sensor, and the same thing happened.
I thought the catalytic converter must have been bad, then, and changed that too, but still no joy. In the end, I just pulled the CEL bulb out, since the engine, ran always great otherwise.
Is there something congenitally wrong with these Nissan engine computers that throw codes with no real problems?
Just wandering......:thatswck:
Val Barone