Q: Check Engine Light and code for O2 sensor

asked by on

The Check Engine Light is on. For a while it would go on and off, but now it is permanently on. We scanned the car and it listed the code for the O2 sensor. The car now stalls out when I turn it on. I have to rev the engine to pump fuel, and after I rev it a few times, it is good to go.

Hello. Knowing the actual code number would help determine the problem. If you are getting an O2 sensor code associated with the way it is running, then the sensor is more than likely bad. On this Toyota, the O2 sensor is actually an air/fuel mixture sensor that tells the computer how much fuel to put into the engine. If it is not functioning properly or if it is not heating correctly, then this will occur. I typically use a computer scan tool with live data to see what the sensor is reading. This is done when the problem is occurring to determine if it needs fixing. If you need further assistance, I recommend you have a mechanic, like one from YourMechanic, inspect for fault codes in the vehicle’s computer system and replace the oxygen sensor if it is said to be damaged.

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 and code for O2 sensor

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: Brakes not working well in rain

Hello, thanks for writing in. I'd be happy to help. From what you describe, it sounds like your vehicle is experiencing understeer and hydroplaning. I would recommend taking care of this issue as soon as possible, as the symptoms they...

Q: Car died after battery, brake, and Check Engine light came on.

Hi there. When you get this combination of warning lights and symptoms it is typically the result of a battery that has failed. If the battery voltage gets low enough then the check engine light and the brake light can...

Q: MY CAR WILL NOT DRIVE FORWARD WHILE IN DRIVE.

Hello, and thank you for writing in. A low transmission fluid level means there is a leak somewhere in the system that needs to be addressed. With automatic transmissions, the coolant levels make the entire operation functional. With low fluid...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...