Q: Check engine light when running heater.

asked by on

I usually head to work early and sit in my car for a bit before going in. With the colder weather here, I sometimes let the heater run. After only a couple minutes, the check engine light comes on (codes P1166 and P1167) this only happens when I'm sitting idle while running the heater. I can go weeks of driving and running it wroth no error, until I sit for 5 minutes without driving.
Any ideas?

Hello, thank you for writing in. Lets discuss the codes individually. The P1166 stands for the air/fuel ratio sensor giving you false readings. This may be due to a poor wiring connection, or a failing sensor. P1167 is telling you that the issue is electrical and most likely not a symptom of the vehicle’s engine malfunctioning. At this point, you will want to double check the connection to the sensor and make sure it is clean, dry, and tight. If the connections look fine, chances are there is an issue with the sensor itself, and it will need to be replaced. For more help resolving the issue, contact our service department to schedule an appointment.

Was this answer helpful?
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. Check engine light when running heater.

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: Q: oil pressure switch

The "apparent" oil pressure switch malfunction is not a cause of the stalling or misfiring. That malfunction with the switch has to be diagnosed and confirmed because sometimes there is nothing wrong with the switch itself but rather there is...

Q: Q: Check Engine light

The Check Engine Light will come on for a number of reasons. Since the light is on, I would start by scanning the computer for codes. The codes will help to isolate the problem. If the light is flashing, then...

Q: I found out I need a steering fluid pump,and it my acceleration is sluggish,and fan is not moving,and when I try to past 35mph,my

Hello. From what you describe it would appear that your vehicle is experiencing more than one problem. If the pump and AC blower motor are bad then they will need to be replaced to restore functionality to both systems. The...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...