Engine light, codes P0101 and P0456

  • 1.8L
  • 4 CYL
  • 2WD
  • 46,600 MILES
I bought the car listed above base (4D) brand new, and it has been driving well. The mileage is low: 46,600 miles for 9 years. Mainly used for short drive to work or grocery purchase.

In the past year or so the engine light has been on for multiple times. At the beginning the code is P0101. Tried multiple things, and the code comes up in a few weeks or a few months: bought a new gas tank cap, replaced engine air filter, cleaned mass air sensor, replaced mass air sensor.

Recently there is another code show up P0456. Not sure what to do. Get a new gas tank cap? Check the fuel pressure?

There are couple things I can think of that might or might not relevant:
- noticed that the engine oil is consumed somehow. I put about 4.75 qt engine oil each time about 6 months, and recently noticed the decanted old oil is quite less, guess about 4.0 qt or so. Maybe there is small leak somewhere, but no oil stain observed beneath the car.
- The car hit curb and pit hole several times, the cover underneath the engine was ripped off one time and get replaced one, the front right wheel was slightly bent one time and was hammered back.
- The battery red pole is very easy to get rust, has cleaned multiple times, but accumulates much faster than my other car.
Wednesday, January 1st, 2020 AT 10:39 PM

1 Reply

  • 4,897 POSTS

Okay, so Direct Trouble Code[DTC0 P0101 is a DTC dealing with your vehicle's Mass Air Flow Sensor[MAF] and DTC P0456 is a DTC dealing with your vehicle's Evaporative Emissions[EVAP] system, which collects fuel vapor in a canister until the Power-train Control Module[PCM] decide it needs to burnt in the engine's combustion chambers as part of normal vehicle operations. In the diagrams down below I have include the diagnostic troubleshooting guides for both DTC P0101 and P0456 from the vehicle manufacturer specifically for your vehicle. I have also included guides on how to find opens, shorts to power, and shorts to grounds in an automotive electrical circuit for you as well. You will need to use a Digital Multi-meter [DMM] to use the guides, so here is a link below explaining how to use one, if needed:


Please go through these guides and get back to us with what you are able to find out.

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Thursday, January 2nd, 2020 AT 1:39 AM

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