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Check Engine light off by itself

The check engine light has been on for few days. I went to Autozone, loaned a OBDII tool, checked and then erased the code. There are two codes. Suddenly the check engine light turned off by itself. Haven’t had time to look into this.

P1250
Manufacturer control fuel air metering

P0455
Evap emission control system leak (large)

some details
Engine RPM 742
Load value 15.6%
Coolant temp 199F
Short term fuel trim 1 -147%
Long term fuel trim 1 0.7%
Short term fuel trim 3 -100.6%
Long term fuel trim 3 -100.6%
Speed 0
Fuel sys 1 clsd

Update: Check Engine light on again (May 3)

This entry was posted on February 12, 2008 at 1:05 am and is filed under Car with tags , , , , , . You can follow any responses to this entry through the RSS 2.0 feed You can leave a response, or trackback from your own site.

2 Responses to “Check Engine light off by itself”

  1. Automotive Forum Says:
    February 13, 2008 at 12:57 am

    My car (e46) had a similar problem and it was the mass airflow sensor. It was under warranty. I don’t know if this helps you but, I thought I’d share it with you.

    Reply
  2. Hao Says:
    February 14, 2008 at 10:29 pm

    Thanks for letting me know. I have heard from a BMW service staff that it’s not unusual that the check engine light will go off by itself and it’s a not big deal. So I haven’t went to mechanic shop for a inspect.

    Reply

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