Q: Q: i have a check engine light on

asked by on

i took my car to get the check engine checked and they gave me codes p0012 and p0171. i took my car to my mechanic because i recently got my engine fixed and i took it to fix the air leak. but now idk about the camshaft if i need to replace it or something else

My car has 121000 miles.
My car has an automatic transmission.

Hello there, thank you for asking about your 2004 Toyota Camry. Code P0012 relates to the camshaft position sensor which monitors the speed of the camshaft and relays this information to your car’s computer, which helps to control ignition timing and fuel injection pulse. Code P0171 relates to a lean air/fuel mixture which can be caused by a number of things such as:

  • Intake air leaks
  • Faulty front heated oxygen sensor
  • Ignition misfiring
  • Faulty fuel injectors
  • Exhaust gas leaks
  • Incorrect fuel pressure
  • Lack of fuel
  • Faulty Mass Air Flow (MAF) sensor
  • Incorrect Positive Crankcase Ventilation (PCV) hose connection

I would recommend having an expert from YourMechanic come to your home to diagnose your codes](https://www.yourmechanic.com/services/check-engine-light-is-on-inspection) and replace the camshaft position sensor if needed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Q: i have a check engine light on

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: How do I use the armrest in the rear seat?

If there are only one or two passengers in the rear seat, they can pull down the arm rest to use it for a cup holder or to rest their arms. Tip To prevent damage, don’t place too much pressure...

Q: Trying to locate my camshaft position sensor

Hello, thank you for writing in. The camshaft position sensor is located towards the front of the engine directly at the end of the camshaft. Due to not being able to see the camshaft, you are going to want to...

Q: Car stutters and stalls then CEL comes on. Throws code for Camshaft position sensor.

Hi There, The camshaft position sensor code (Generally, P0340) relates to the camshaft position sensor not reading the camshaft activity correctly. This may have happened as a result of it being bumped or disturbed while replacing the radiator or possibly...

Related articles

What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.