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Need help with my check engine light

3053 Views 5 Replies 5 Participants Last post by  Sartor
I have a 2002 Frontier extended cab and went "off-roading" last weekend. It was basically a long, flat dirt road that was wet as can be, and I decided to get loose. I flicked the rear left and right over and over while roosting the tires the whole time. Kept it under 4,500RPM the whole time.
After about 10 min of this, the check engine light went off and I lost power. Everything worked, except I put my foot down and the engine didnt go. I turned the truck off and back on, and it has worked well since then.
I ran the code, and its P0103 (High voltage to the mass airflow sensor), but I found this on the driver footwell the next day and was wondering if its related.

I would like to solve this myself instead of getting shafted by some shop. Thanks in advance for any help!
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I have no clue what the answer is but I have to give you props, you googled the code and told us both the number and the description, then you also included a picture. Above all of that, you gave us a bit of info on the truck but the only thing you left out is if you are I4 or V6?

To take a shot in the dark, you may have gotten your MAF dirty and it may be just freaked out or it may still be a bit dirty. I would wash/replace the air filter and check the MAF to see if it is clean or what. Do not clean it with a rag or carb cleaner or what, just use MAF cleaner since the filament is very sensitive.
I4 all day!

Does kragen or napa sell MAF cleaner or air filter cleaner?


I went on the forums today and found the key combo to reset the service light. Its off now. While I was at it, I used the key combo to reset the airbag warning light. its off now as well. amazing what the internet can do!
Hey Tumbler,

Do you have a link to the post on how to reset the service engine light? Been searching for a while now and can't find it.

this should work for the frontiers;
Operations Procedures

1. Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.
2. Repeat the following steps (2a and 2b) procedures quickly five times within 5 seconds.
2a. Fully depress the accelerator pedal (HARD).
2b. Fully release the accelerator pedal.
3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the CEL starts blinking.
4. Fully release the accelerator pedal (while the CEL is still blinking)
5. Wait about 10 second.
6. Fully depress the accelerator pedal and keep it for more than 10 seconds.
7. Fully release the accelerator pedal (The CEL light will continue to blink).
8. Turn ignition switch to “OFF” position and now you can start the car. The CEL light should be gone.

If the CEL light continues to remain ON, repeat the above steps. Timing is EXTREMELY critical to resetting the ECU.
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I have noticed that with the stock air cleaner getting moist, it doesnt run well at all. also, steam inside your engine compartment can damage/ruin electrical components.
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