What does code P0133 mean and is it safe to drive?
P0133: O2 Sensor Slow Response (Bank 1, Sensor 1). Here’s what it means, what usually causes it, what repairs typically cost, and how urgent it is to keep driving.
PowertrainGenerally safe to drive
Repair cost
$100–$300
System
Powertrain
Urgency
low
What this code means
The upstream oxygen sensor on Bank 1 is responding too slowly to changes in exhaust composition. A healthy O2 sensor switches between rich and lean several times per second; a sluggish sensor causes poor fuel control.
Common causes
- Aging or contaminated upstream oxygen sensor
- Oil or coolant contamination fouling the sensor
- Carbon buildup on the sensor tip
- Weak heater circuit in the sensor
Symptoms
- Check Engine Light
- Slightly decreased fuel economy
- Possible rough idle
- Failed emissions test
Typical fixes
- Replace upstream oxygen sensor
- Check for oil/coolant burning that could foul new sensor
Repair cost range
Repairs for P0133 often fall between $100 and $300, depending on the cause and your vehicle.