Warning light diagnosis · Liverpool
Engine Warning Light On? Diagnosis in Liverpool
Engine management light, ABS, airbag or glow plug light on your dashboard? We read the fault codes, find the cause and fix it properly, not just switch the light off.
Open from 8am
Monday to Saturday
All makes & models
Petrol, diesel, hybrid and EV
Payment Assist
Spread the cost, no interest
Since 1987
Experienced local mechanics
Engine Management Light On? What to Do First
The colour of the light tells you how urgent it is.
- Red light: stop as soon as it’s safe and switch off. Red usually means oil pressure, engine temperature, brakes or charging. Don’t keep driving.
- Amber light: the car has logged a fault. It’s normally safe to drive carefully, but get it checked soon.
- Flashing engine light: usually an engine misfire. Ease off, avoid hard acceleration and get it looked at straight away, as it can damage the catalytic converter.
Why Is My Engine Management Light On?
The engine light comes on when the engine computer sees a reading outside its normal range. Some of the most common causes we see are:
- A faulty oxygen (lambda) sensor
- Worn spark plugs or ignition coils causing a misfire
- A blocked or failing DPF on diesel cars
- A sticking EGR valve
- A failed mass airflow sensor
- A loose fuel cap or a small vacuum leak
Can I Turn Off or Reset the Warning Light Myself?
You can clear the light with a cheap code reader, but if the fault is still there the light will come back, often within a few miles. Clearing it also wipes useful information that helps find the problem. And with the light on, most modern cars will fail their MOT.
We read the stored codes and live data, test the part the codes point to, and then clear the light once the fault is fixed. That way it stays off.
Other Warning Lights We Diagnose
- ABS and traction control lights
- Airbag (SRS) light
- Glow plug light on diesels
- DPF light
- Battery and charging light
- Power steering (EPS) light
- Tyre pressure (TPMS) light
If you’re not sure what a light means, check your handbook or call us on 0151 737 1520 and describe it. You can also read about our full engine diagnostics service.
FAQs
Common questions
Can I drive with the engine management light on?
If it’s amber and steady and the car drives normally, you can usually drive carefully to a garage. If it’s flashing, or the car is losing power, running roughly or overheating, stop and get it checked before going further.
Will my car fail its MOT with the engine light on?
On most modern cars, yes. A lit engine management light is an MOT failure, as are ABS and airbag warning lights.
Why has my warning light come back after being reset?
Because the fault that caused it is still there. Resetting only clears the stored code. Once the actual fault is repaired, the light should stay off.
How much does a warning light diagnosis cost?
Call us on 0151 737 1520 for a price. We’ll always tell you what we’ve found and what the repair will cost before doing any work.
Book your car in
Pick a date and we’ll confirm your slot. MOTs available daily.
Opening hours Mon – Sat from 8:00am
- Monday – Friday8:00am – 5:30pm
- Saturday8:00am – 1:30pm
- SundayClosed
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- Free MOT retest*
- Free MOT reminders
- All makes & models
- Payment Assist available
