Skip the auto shop - Our mechanics make house calls

Q: Check engine light is on for a O2 Sensor-high voltage

asked by on

My check engine light on, Regarding O2 electrical circuit signal had high voltage for a predetermined period.
My car has an automatic transmission.

Hello. Usually a high-voltage O2 sensor check engine light code will be caused by a faulty O2 sensor itself. Though at times it can be caused by other issues such as shorted wiring, a leaking vacuum line, or even a leaking fuel injector. Most likely the O2 sensor itself is at fault, but I suggest that you have a technician evaluate your vehicle to ensure that it is the O2 sensor so we can prevent reoccurring headaches. We will send you an estimate for the replacement of your sensor as well as an estimate for diagnosing your check engine light. The technician will diagnose this issue both visually and with a scan tool.

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

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: Im trying to find a part number for a front right side cv axle for a 2001 Mercedes e320 4matic sedan

Part # 210-330-10-01

Q: Steering wheel gets stuck left, grinding noise - 2004 Dodge Ram 2500

Hello. It sounds like the steering gear box and/or the power steering pump is going bad. The steering gear box is what is allowing the wheels to turn left and right when using the steering wheel. There are gears and...

Q: P0128 code, but coolant is full

This is most likely caused by the thermostat partly stuck open. The coolant sensor would need to be tested to make sure it is not bad, though. I would test the thermostat at the housing with a temperature tester, and...

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 Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...