Skip the auto shop - Our mechanics make house calls

Q: How to repair the P2238 trouble code in my car

asked by on

I have P2238 error coming up and I need it repaired.

Hi there. This P2238 code is set when the engine computer detects a short circuit on the heater for the 02 or AF sensor.The short is generally in the sensor itself and replacement corrects the condition. However, there could be a short in the wire harness or inside the engine computer.

A digital volt/ohm meter can be used to check the heater resistance of bank 1 sensor 1 02/AF sensor. If it is lower then specified, then replace the sensor. Further inspection may be needed if the wire harness or engine computer are at fault.

YourMechanic has several available technicians that can assist you with a Check Engine Light inspection and O2/AF sensor replacement as necessary. Best of luck.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Check Engine light comes on when cars RPMS go over 4000 error code P0344

Hi there. This code is for a bad camshaft sensor. It can be caused by a bad sensor or it can come from another issue. I usually check the sensor first and then I check the timing belt. Most of...

Q: Engine stalls after a few minutes.

It is normal operation for the Check Engine Light to turn on when the key is in the engine run position and the engine is not running. As soon as the engine is started it should go out within 2-3...

Q: Which oxygen sensor usually fails first? I don't have a code reader to tell which one is bad.

Hi. In my experience, I haven't really seen one oxygen sensor fail more than the other one. Considering the year of the truck, I would replace all the oxygen sensors on the truck because, if one is going bad, then...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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 to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...