Skip the auto shop - Our mechanics make house calls

Q: How hard is it to change the O2 sensors?

asked by on

All four oxygen sensors show to be bad on diagnostic tool of the mechanic who installed my used 2005 Ford Escape 6cyl engine. He said it is due to the used engine sitting up and then blowing out carbon build up, messing up the O2 sensors. Is this accurate? I read that sometimes O2 sensors show to be bad if there is any leak in the exhaust system.
My car has an automatic transmission.

Hello. I have never seen all four oxygen sensors go bad on a vehicle all at one time. They will fail one at a time and the only time it would need all four would be if they failed one at a time and were never replaced. It is very common to get oxygen sensor codes when there is something else going on with the engine or the exhaust. I usually see what the sensors are doing on a scan tool and then check and see if the issue can be ignition or fuel related. If you need to have these oxygen sensors checked out, consider having a technician from YourMechanic come to your home or office to diagnose the problem and replace the oxygen sensors if needed.

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: vacuum hose

Hi there: In most cases, a vacuum leak causes simple performance issues, but it can cause serious engine damage if it's serious enough; which is why you shouldn't drive it anywhere until it's replaced. You should ask a friend to...

Q: What is the best inexpensive o 2 sensor I can buy for a 2006 cayenne base?

The best thing to do is check with your local parts store or an online store for the best pricing on an oxygen sensor for your vehicle. If you need further assistance with replacing the oxygen sensors, then seek out...

Q: front brakes frozen after replacing vacuum booster 1977 f250 camper special with dayton brakes double calipers

Hi there. This issue can be caused by multiple issues; mainly the vacuum booster is not releasing pressure due to a vacuum line that is not fully secured. It's also possible that the brake line has an air bubble or...

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...
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...