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

asked by on October 26, 2016

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?
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

What do you call the plastic water tank fitted on the sides of the radiator.

This water filled plastic tank is sometimes referred to as an overflow tank, an expansion tank, or a reservoir. The expansion tank is a vessel that is designed to allow anti-freeze and air that are inside your coolant system to...

Car has loss of power when accelerating.

Loss of power on acceleration can be due to plugged fuel injectors, faulty oxygen sensors, fuel pump and/or filter, vacuum leaks including that caused by a faulty EGR system, ignition system malfunctions, bad valve timing if the timing belt or...

Is it normal for the srs light to be on in my 2002 Honda Accord?

The supplemental restraint system (SRS) light should come on momentarily when the ignition is turned on. It should then go out. If the light stays on continuously, there is a problem in the SRS system. The cause of the light...

Related articles

P2128 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch "E" Circuit High Input
P2128 P2128 trouble code definition The pedal position sensor is used as an input to the engine control module (ECM) to determine the amount of torque requested by the operator. The ECM should receive an input that is within the...
P0147 OBD-II Trouble Code: O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 3)
P0147 P0147 code definition O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 3) What the P0147 code means P0147 is the OBD-II generic code indicating the Engine Control Module (ECM) has tested the O2 sensor heater circuit during startup and...
P2648 OBD-II Trouble Code: A Rocker Arm Actuator Control Circuit Low Bank 1
P2648 means there is a problem with a short or open electrical circuit in rocker arm actuator control circuit A due to low oil or a faulty oil valve.