LF Wheel Speed Sensor Circuit Range/Performance Problem
The left front wheel speed sensor is reporting an abnormal signal.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The computer checks how fast each wheel is spinning. If the left front wheel shows a weird speed or isn't sending a signal, the computer gets confused and sets this code.
What the computer is actually seeing
The ABS module expects the left front wheel speed signal to match the other three wheels within a certain percentage (typically within 10%). If it sees a difference, like the left front wheel showing 0 while others are moving, it triggers the code.
What a healthy reading looks like
Normal wheel speed is between 0-40 mph while moving, with voltage output typically around 0.5 to 3 volts depending on wheel speed.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Inspect wiring and connectors for the left front wheel speed sensor for damage or corrosion. Correct any issues found.
- 2Check the sensor itself for debris, dirt, or any physical damage. Clean or replace the sensor if necessary.
- 3Test the wheel speed sensor output using a multimeter. At rest, it should show around 0 volts, and while the wheel spins, it should vary between 0.5 and 3 volts depending on the speed.
- 4If the sensor checks out, use a scan tool to monitor the wheel speed data. Compare the left front wheel speed to the speeds of the other three to diagnose further.
Common causes
- Faulty left front wheel speed sensor
- Damaged or corroded wiring or connectors to the sensor
- Bad ABS control module
- Dirty or obstructed sensor area (such as debris on the wheel hub)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended. The ABS may not function properly, which affects your braking performance.
Will this code come back after I clear it?
If the issue isn't resolved, the code will likely return after driving for a bit.
Why does this code appear with other codes?
It often appears with other wheel speed sensor codes because diagnostics can affect multiple sensors due to shared circuits.
Working a real vehicle right now?
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