Skip the auto shop - Our mechanics make house calls

Q: Check engine light keep coming up change all 4 o2 sensor and still engine light comes on. Wand they are new

asked by on

I change all 4 sensor bran new and still the light comes on and still say is the sensor but i change them all new , what u think it is please help......

My car has 172000 miles.
My car has an automatic transmission.

A: Unfortunately in order to give you a better...

Unfortunately in order to give you a better answer I would need to know what code is setting in the computer. Depending on what code is stored you may have a problem with the catalytic converters in the exhaust, or there may be an issue with a vacuum leak causing the fuel trims to be out of whack causing a code to set. You can have a certified mechanic, such as one from YourMechanic, verify the cause of your Check Engine Light and let you know exactly what needs to repaired. This way, you won't be throwing your money at parts that do not need to be replaced.

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

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!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Losing power steering fluid

If the pressure line is leaking, it will need to be replaced. When the pressure within the line is very high and cannot be patched or spliced. I recommend having a trained technician, like one from YourMechanic, inspect your power...

Q: Location of blinker flasher

When you look at the fuse block under the left side of the dash you will see a big flasher. This is the flasher for the turn signals. The hazard flasher is on the back side of the fuse box...

Q: My 2003 Town Car is showing that the 8th cylinder is misfiring. Do I have to replace the ignition coil as a result?

Hi, thanks for writing in. A misfire code only says the cylinder is not contributing to power in the motor. You may have no or low compression, a bad coil, injector problems, or a plug problem. Have the coil removed...

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...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...