Q: Had Oxygen sensor replaced twice by different shops. Still get this code intermitently.

asked by on February 20, 2017

After replacement of O2 sensor on Northstar engine multiple times, everything is ok for some period of 1 day to a month. This last time failure occurred after about 2 weeks and after driving in a rainstorm. Since we've replaced this O2 sensor multiple times it appears to be something else. Also, performance and or gas mileage does not seem to suffer when the service engine soon light is on. So, as above, can it be a broken wire or connector that is intermittent? Can this portion of wiring harness be replaced? If so so how much$$?

My car has 150000 miles.
My car has an automatic transmission.

Hello. A technician will have to diagnose your vehicle to see exactly which wiring is at fault. There are other things which can cause an oxygen sensor check engine light such as a vacuum leak or a bad catalytic converter. A technician with the scan tool capable of reading live data will be able to test the oxygen sensor and read the data of the other sensors to determine what is causing your oxygen sensor issue to reoccur. There may be a wiring issue such as a wire rubbing on the hot exhaust causing it to short-circuit. I will ask customer support to send you a price quote for the inspection of your check engine light.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Driving and accelerating cause loud squealing in front of car.
The noise you are hearing is the engine serpentine belt. The belt is turned by the crankshaft pulley and the belt will then turn the other accessories like the tensioner,v-power steering, water pump, air conditioner compressor and idler pulleys. The...
What kind of fuel should I use?
You should use unleaded gasoline, with an octane number of 87 or higher.
Cylinder 2 misfire
You need to pull out the coil and check to see if there is oil in the spark plug hole, or on the plug wire boot. If there is, then replace the valve cover and spark plug boots after cleaning...
Do I have to drop the tank or can I access it from the back seat to change the fuel pump thank you
You can access fuel pump by removing the access panel in the very front of the trunk by rear seat. if you find you are needing help with this repair, a certified technician from YourMechanic can come to your home...
Whilst driving the car will cut out. In the begining it would start immediatetly now if it cuts out it doesnt want to start
Hello. I would need to know the model of your Toyota to be able to give you the best information. From what you are telling me though it sounds like the crank sensor harness may be damaged or that one...
Unable to start my car - 2014 Honda Civic
Hi there. Although it's very difficult to diagnose why a car is not starting issue without being there to inspect this issue, you may have a problem with the ignition system or the FOB key (if you have a keyless...
accidentally added windshield washer to coolant line instead of washer tub, just a little, maybe 1/8 of a gallon.
Hi there. A little window washer fluid will not cause any damage to your engine or the cooling system, in fact it will actually make the system work a little better as the fluid has alcohol in it. Alcohol will...
Overheating, white smoke from under the hood, leaking coolant, heater blowing cold air 2007 Saturn Relay
Hi there - from your symptoms, a failed water pump (https://www.yourmechanic.com/question/my-water-pump-leaks-and-shoots-out-water-by-sasha-p), or ruptured coolant hose is the likely cause of the failure you experienced. I recommend a cooling system inspection (https://www.yourmechanic.com/services/coolant-is-leaking-inspection) performed by a mobile, professional mechanic, such as one...
I was told my engine was seized however it starts and the motor runs. My mechanic is clearing lying to me. Can A seized engine run
Hi there. If the engine is currently running, it would not mean it has seized up. Although the engine is running, it is possible that the engine may have locked up (due to lack of lubrication). The biggest problem with...

Related articles

What Sensors Do All Cars Have? And What Optional Ones Are There?
Modern cars have an increasing amount of sensors. Most cars have an oxygen sensor and a throttle position sensor, but parking sensors are optional.
How Are Sensors Used to Improve a Car’s Performance?
Modern vehicles utilize a series of car sensors to improve performance and reduce emissions. The oxygen sensor helps reduce tailpipe emissions.
A Buyer’s Guide to the 2011 Buick Lucerne
2011 2011 marked the final year of production for the Buick Lucerne, a venerable full-sized sedan that offers ample room in the interior. The car was noted for the significant amount of interior space and trunk space offered, although it...