Is It Safe to Drive With a P0133 Code?
Common Symptoms of a P0133 Fault
EML on
Slightly increased fuel consumption
Poor emissions
No significant driveability issues usually
Possible Causes of P0133
A P0133 code can be triggered by faults across several systems. Identifying the exact root cause requires proper diagnostic equipment and live data — not just reading the code.
Aged / Worn O2 Sensor
Sensor element has deteriorated over time and responds slowly.
Exhaust Leak
Exhaust leak diluting sensor readings causing apparent slow response.
Sensor Contamination
Oil, coolant or silicone contamination slowing sensor response.
Wiring High Resistance
High resistance in the sensor circuit causing delayed signal.
Why we don't list the exact part: A P0133 code tells you what's happening but not why. Replacing parts based on the code alone is the most common way drivers waste money. A proper diagnosis identifies the specific cause first.
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P0133 and Your MOT
A stored P0133 fault code will cause your car to fail its MOT. The engine management light will be illuminated during the test — an automatic failure under current MOT standards. Even if the light temporarily clears, the code remains in ECU memory and can be read by testers.
Get the fault diagnosed and repaired first, then have the code cleared and confirm the light stays off before booking your MOT.