What does code P0133 mean on a Honda and is it safe to drive?
P0133: O2 Sensor Slow Response (Bank 1, Sensor 1). Here's what it means on your Honda, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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 for your Honda
- 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
For a Honda, repairs for P0133 often fall between $100 and $300, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Honda
Honda P0133 on older J-series and K-series engines is typically an aging upstream sensor. On V6 models, access to the Bank 1 sensor is tight—factor in labor time. Genuine Denso sensors are strongly recommended over aftermarket.
Most commonly affected models