Low — S1Audi A4 · european tier
B0078 on Audi A4
The B0078 diagnostic trouble code on a Audi A4 indicates third row right seat belt pretensioner deployment control. For Audi vehicles, this code is commonly triggered by faulty seat motor/module — most common cause, test before replacing or damaged or corroded wiring/connector in the power seat system circuit.
Can You Still Drive?
Safe to drive. Check at your convenience.
Estimated Repair Cost
$100 – $800
for Audi A4
Common on This Vehicle?
B0078 appears less frequently on Audi A4 models but should still be diagnosed promptly.
Repair Costs for B0078 on Audi A4
These repairs are commonly needed to resolve the B0078 code on a Audi A4:
See all repair costs for Audi A4 →Symptoms on Audi A4
- •Seat memory settings not saving or recalling correctly
- •Power seat won't move in one or more directions
- •Diagnostic trouble code (DTC) stored in module memory
- •Fault may be intermittent — code may clear itself and reappear
- •Reduced vehicle functionality related to the power seat system
Common Causes
- •Faulty seat motor/module — most common cause, test before replacing
- •Damaged or corroded wiring/connector in the power seat system circuit
- •Blown fuse or faulty relay for the power seat system
- •Poor ground connection — check and clean all related ground points
- •Control module fault — rare but possible, only consider after ruling out simpler causes