Is it safe to drive with a P0133 code?

Severity is low. Address P0133 sooner rather than later — driving with an active check engine light can worsen the problem or void emissions warranties.

How much does it cost to fix P0133?

Repair costs for P0133 typically range from $40 to $300 in the US, depending on the underlying cause. The most common fix is: Aged/worn O2 sensor (most common at 80k+ miles).

What are the symptoms of P0133?

Check engine light. Slight fuel economy drop. Occasionally paired with catalyst codes (P0420).

Check Engine Code

P0133

O2 Sensor Circuit Slow Response (Bank 1, Sensor 1)

Severity: low DIY difficulty: 2/5 Typical cost: $40–$300

Last updated April 30, 2026

What P0133 means

P0133 means the ECM measured how quickly the O2 sensor swings between rich and lean and found it too sluggish. Sensors degrade over time — most aftermarket sensors last 60-100k miles.

Symptoms

Check engine light
Slight fuel economy drop
Occasionally paired with catalyst codes (P0420)

Likely causes (most common first)

Aged/worn O2 sensor (most common at 80k+ miles)
Contaminated sensor (oil burn-off, coolant, bad fuel)
Exhaust leak near the sensor
Failing sensor heater circuit

Can I keep driving?

Low — mostly emissions/economy

Typical repair cost

DIY fixes can start near $40 (parts only). Shop repairs for P0133 typically run up to $300 depending on the underlying cause and vehicle. Start with the most common cause — Aged/worn O2 sensor (most common at 80k+ miles) — before throwing parts at it.