Left Fog Light Circuit Open
The B0077 code means the vehicle's onboard diagnostic system has detected: Left Fog Light Circuit Open. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $15 - $180 (parts and labor)
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Common Symptoms
- Left fog light not illuminating
- Asymmetric fog light pattern
- Fog indicator on but left not working
- Reduced fog visibility on left
Probable Causes (Ranked by Likelihood)
- Burned out fog light bulb Very High
- Corroded connector from road spray High
- Damaged wiring at bumper Moderate
- Failed fog light relay Low
Step-by-Step Diagnostic Procedure
-
Inspect fog light bulb
-
Check connector for corrosion
-
Test voltage at socket
-
Check relay and fuse
Frequently Asked Questions
Why do fog lights fail more often?
Mounted low with more road spray, debris, and water exposure.
Can I replace without removing bumper?
On many vehicles, the bulb is accessible from behind the bumper.
Is it illegal with one out?
Asymmetric lighting can be cited in some jurisdictions.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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