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.

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

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 abs light and tcs light brake light came on the same time

Your car is equipped with what are called wheel speed sensors which monitor the speed of the wheels at all four corners. When they detect that wheel speed is out of the ordinary in a given set of conditions, this...

Q: Vacuum leak

Hi. This is a very common failure on vehicles like yours. So common, in fact, that there is a technical service bulletin (TSB) on it. The TSB is XT303-13 and it addressed the hissing sound from under the hood, as...

Q: Changed battery now won't start

If prior to changing the battery you had no problems, obviously the immobilizer system is a suspect. Confirm that the engine immobilizer system (security system) is not activated thus preventing the car from starting. If the immobilizer system is on,...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...