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So I started my Nissan Versa SL 08 a few days ago and noticed the check engine light was on. I went to an auto zone to for the free diagnostic, and it was throwing the code P1421.
It turns out there is a service bulletin for this, with the possible causes listed as:
- Lack of intake air volume (block air filter)
- Fuel injection system (Clogged fuel injector or bad fuel pump)
- Faulty Engine Control Module (ECM)
I am not experiencing any "drivability" or starting problems so I am assuming the ECM is faulty. Of course I don't want to pay ~$100 bucks for the dealer to reprogram the ECM so I tried resetting it. I disconnected the battery and it was a no go. Then I tried the pedal trick (key in, wait 3 seconds, press accelerator 5 times, wait 7 seconds, hold accelerator for 10 seconds) and the light still came on.
After that I tried replacing the engine air filter and reset the ECU using the pedal sequence. Initially, that seemed to work--the check engine light was no longer on. I drove for maybe 30 miles and then the check engine light would come on for a second and shut off again. I parked the car for maybe 10 minutes and, on start-up, the light came back on and did not shut off. In total I have gone about 60 miles with the new air filter and don't seem to be using any more fuel than normal.
Is there anything else I can try before taking it to the dealer?
Thanks!
P.S. Would this fix be covered under the 96 months/80,000 Federal Vehicle Emission Control Limited Warranty since, according to this, the ECU affects vehicle emissions?
It turns out there is a service bulletin for this, with the possible causes listed as:
- Lack of intake air volume (block air filter)
- Fuel injection system (Clogged fuel injector or bad fuel pump)
- Faulty Engine Control Module (ECM)
I am not experiencing any "drivability" or starting problems so I am assuming the ECM is faulty. Of course I don't want to pay ~$100 bucks for the dealer to reprogram the ECM so I tried resetting it. I disconnected the battery and it was a no go. Then I tried the pedal trick (key in, wait 3 seconds, press accelerator 5 times, wait 7 seconds, hold accelerator for 10 seconds) and the light still came on.
After that I tried replacing the engine air filter and reset the ECU using the pedal sequence. Initially, that seemed to work--the check engine light was no longer on. I drove for maybe 30 miles and then the check engine light would come on for a second and shut off again. I parked the car for maybe 10 minutes and, on start-up, the light came back on and did not shut off. In total I have gone about 60 miles with the new air filter and don't seem to be using any more fuel than normal.
Is there anything else I can try before taking it to the dealer?
Thanks!
P.S. Would this fix be covered under the 96 months/80,000 Federal Vehicle Emission Control Limited Warranty since, according to this, the ECU affects vehicle emissions?