Right Fog Light Circuit Malfunction
What does B0045 mean?
The B0045 code means the vehicle's onboard diagnostic system has detected: Right Fog Light Circuit Malfunction. This is a low severity code.
Common Symptoms
- Right fog light not working
- Asymmetric fog light illumination
- Fog light dash indicator not lighting up
- Right fog light flickers or cuts out
- Warning message for exterior lighting
Probable Causes (Ranked by Likelihood)
- Burned out right fog light bulb Very High
- Water intrusion in fog light housing High
- Corroded connector at fog light assembly Moderate
- Damaged wiring from road spray or debris Low
Step-by-Step Diagnostic Procedure
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Check right fog light bulb for failure
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Inspect fog light housing for moisture or water damage
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Test connector for corrosion and secure fit
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Verify power supply at fog light with multimeter
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Inspect wiring from relay to right fog light
Frequently Asked Questions
Can moisture in the fog light housing cause bulb failure?
Yes. Water intrusion is a common cause of fog light bulb failure. Moisture can cause the bulb to crack from thermal shock or corrode the socket contacts over time.
Should I replace fog light bulbs in pairs?
It is recommended. Fog light bulbs dim over time, and a new bulb paired with an old one will create uneven lighting. Replacing both ensures balanced light output.
Do fog light bulbs use the same type as headlights?
Usually not. Fog lights often use smaller bulbs such as H8, H11, H16, or 880/881. Check your owner's manual for the correct fog light bulb type.