OBD Guide

C004A

Brake Lining Wear Sensor

Severity
🚨 Critical
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$22–556 (est.)

Symptoms

  • Oil pressure indicator is on
  • Knocking or noise from the engine
  • Reduced engine power
  • Engine overheating

Causes

  • Low oil level
  • Worn oil pump
  • Dirty oil filter
  • Excessive engine wear
  • Oil dilution (fuel or coolant ingress)
  • Oil pressure sensor malfunction

How to Fix

  1. Check the oil level and add if necessary
  2. Change oil and oil filter
  3. Check the condition of the oil pump
  4. Conduct engine diagnostics for wear
  5. Replace the oil pressure sensor if it is faulty

Related codes

Error C004A by Vehicle Brand