Skip the auto shop - Our mechanics make house calls

Q: P0133 code change O2 sensor two times still sets the same code after about 200 miles.

asked by on

Why does this keep resetting. Used good Denso O2sensor, what's going on?

My car has 156000 miles.
My car has an automatic transmission.

A: Hi there. From the description you have giv...

Hi there. From the description you have given, for your vehicle’s P0133 code (O2 sensor slow response). It could be an exhaust leak near the O2 sensor causing the O2 slow response code. An exhaust leak could draw air in under light load and keep the O2 sensor from generating voltage over .5 volts.

It could also be low fuel pressure caused by a faulty fuel pump or an intake manifold vacuum leak. In either case, your vehicle’s engine running lean could produce the O2 slow response code.

Finally, it could be an electrical circuit problem, such as an open circuit between the O2 sensor and the ECM (engine control module). The Denso O2 sensors typically are quality sensors. I recommend having the Check Engine code diagnosed more thoroughly by an expert technician. If you’d like to have this done, a certified professional from YourMechanic can come to your car’s location to perform this task.

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: After starting, the transmission will not go into gear

Hi there. Did you replace the pilot bearing when replacing the clutch assembly? A frozen or seized pilot bearing will behave as you describe. Since you mention having to revert to stock clutch components, it is necessary to confirm proper...

Q: Car stutters when accelerating.

You could have gotten some bad gas from a gas station that has a lot of water in the fuel. When there is excessive water in the fuel, the engine will tend to run rough at a low rpm and...

Q: Random startup problems, AAA battery service

Hello. It sounds like the engine does not crank at all when this occurs. This is typically caused by a failing ignition switch or transmission position sensor. The most common issue I have come across on this vehicle is the...

Related articles

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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...