How Much Do Car Diagnostics Cost?
Diagnostics · 4 min read
A warning light comes on and the first question is: what will it cost just to find out what's wrong? Most garages charge for a diagnostic. Here's what the going rate is, what a proper diagnostic actually involves — and why ours is free.
What most UK garages charge
A diagnostic check at most garages costs somewhere around £40–£100, sometimes charged as an hour's labour. Main dealers can charge more. That fee is just to read the fault and investigate — before any repair. At SS ADAM LTD we don't charge it: our plug-in diagnostic check is FREE, and you get a no-obligation written quote before any work begins.
A code reader is not a diagnosis
Plugging in and reading a fault code is only the starting point. A code like 'P0300' tells you there's a misfire, not why — it could be plugs, coils, injectors, a vacuum leak or a sensor. A real diagnostic interprets the codes alongside live sensor data and the car's symptoms to find the actual cause. That's how you avoid the classic trap: paying to replace parts that were never faulty because someone just 'cleared the code'.
Why we make diagnostics free
We'd rather tell you honestly what's wrong and quote it fairly than charge you just to look. It builds trust, and most people are happy to have us do the repair once they know the price up front. So there's no risk in bringing your car in when a light appears — you'll leave knowing exactly what's wrong and what it costs, with no bill for the check itself.
When to get a diagnostic
Any dashboard warning light, a flashing engine light (get that checked quickly — it means an active misfire that can damage the catalytic converter), a car that feels down on power, strange noises, or a light that keeps coming back after being cleared. The sooner a fault is diagnosed, the cheaper it usually is to fix.
Frequently asked questions
How much does a car diagnostic cost in the UK?
Most garages charge around £40–£100, sometimes as an hour's labour, with dealers often more. SS ADAM LTD does a plug-in diagnostic check for FREE, with a written quote before any work.
Is a free diagnostic as good as a paid one?
Ours is a genuine plug-in scan interpreted alongside live data and symptoms — not just a code read. We make it free because most customers are happy to have us do the repair once they know the honest price.
What does a car diagnostic actually check?
It reads stored fault codes from the car's computer, then a technician interprets them with live sensor data and the symptoms to find the real cause — so you don't pay to replace parts that were never faulty.
Should I drive with a warning light on?
A steady amber light usually means drive gently to a garage soon. A flashing engine light means an active misfire — ease off and get it checked quickly to avoid catalytic converter damage. Call 07359 070 779.