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 1,000 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!
  1. Home
  2. Questions
  3. How hard is it to change the O2 sensors?

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: my 2005 mercury sable platinum addition LS has a knock in the eingen but it starts good

A clicking or ticking noise is often from the valve train and possible causes are component wear and/or inadequate lubrication due to low engine oil pressure. If you hear a knocking noise that is more typical of lower end faults...

Q: What can cause my oxygen sensor to get damaged during a oil change and fuel system cleaning?

Hi, thanks for writing in. The oil change would not damage an oxygen sensor. The fuel system cleaning could possibly cause this condition, but it depends on the cleaner type and mixture. I would recommend having an expert from YourMechanic...

Q: Constant oil leak.

Hi Juan: Yes, if you simply use the on-line portal to request an oil leak diagnostic a certified Mechanic, dispatched by YourMechanic right to your location, can let you know of your repair options and costs. If you have further...

Related articles

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...