Engine Light & Fault Diagnosis

Welcome to AZ Autos, your local Service, MOT and Repair Garage based in Letchworth, near Hitchin, Hertfordshire. Our expert technicians have years of experience diagnosing and repairing car fault codes for customers across the region.

At AZ Autos, we understand that car fault codes can be confusing and worrying, especially if you are unsure what they mean or how to fix them. That’s why we offer comprehensive Car Fault Code Diagnosis services to help you identify and resolve any issues with your vehicle.

Diagnostics Plugin from £55.

Make A Booking

Engine Light -

We are experienced in diagnosing a wide range of fault codes, including:

Code Description
P0420 Catalyst System Efficiency Below Threshold
P0171 System Too Lean (Bank 1)
P0300 Random/Multiple Cylinder Misfire Detected
P0442 Evaporative Emission System Leak Detected (Small Leak)
P0455 Evaporative Emission System Leak Detected (Gross Leak)
P0401 Exhaust Gas Recirculation Flow Insufficient Detected
P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
P0113 Intake Air Temperature Circuit High Input
P0301 Cylinder 1 Misfire Detected
P0118 Engine Coolant Temperature Circuit High Input

Our Car Fault Code Diagnosis service includes a thorough inspection of your vehicle’s electronic control system, using state-of-the-art diagnostic equipment to identify any issues accurately. We’ll then provide you with a comprehensive report outlining the problem and recommended repair options.

In addition to our Car Fault Code Diagnosis service, we have compiled a list of FAQs to help answer some of the most common questions about car fault codes, including:

  • What is a car fault code, and what does it mean?
  • How can I diagnose a car fault code?
  • Can a car fault code be cleared on its own, or do I need to take it to a mechanic?
  • What are the common causes of a specific car fault code?
  • How much does it cost to diagnose and fix a car fault code?
  • Can I drive my car with a fault code, or should I get it fixed immediately?
  • How do I reset a car fault code?
  • What is an OBD2 scanner, and can I use it to diagnose car fault codes?
  • Can a car fault code indicate a serious problem with my car?
  • What should I do if I keep getting the same car fault code after it has been fixed?

We understand that car fault codes can be worrying, but rest assured that our team of experienced technicians is on hand to help. Book your Car Fault Code Diagnosis appointment with AZ Autos today and let us get to the root of the problem, so you can get back on the road with confidence.