C0033

Left Front Wheel Speed Sensor Signal Erratic

Moderate severity

The control module sees erratic pulses from the left front wheel speed sensor at speed. Common cause is metallic debris on a magnetic encoder or a damaged tone ring.

Common causes

Magnetic encoder ring contaminated
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $90-500
Tone ring cracked or missing teeth
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $90-500
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First things to check

1Confirm the code with a scan tool and check for additional related codes.
2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Related codes

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Frequently asked questions

What does C0033 mean?

C0033 means "Left Front Wheel Speed Sensor Signal Erratic". It is a generic OBD-II code that points to a fault in the chassis.

What are the most common causes of C0033?

magnetic encoder ring contaminated; tone ring cracked or missing teeth; connector with intermittent contact under vibration — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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