UK Vehicle Symptom Guide
A flashing engine warning light means an active misfire โ€” act today

Engine Misfiring or Running Rough?

A misfire โ€” that judder, shake or rough running feeling โ€” is your engine telling you one or more cylinders aren't firing correctly. What's causing it on your specific vehicle is what matters.

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Misfires Are Frequently Misdiagnosed

A misfire is one of the most common reasons people replace parts unnecessarily. Multiple different faults can produce the exact same symptoms โ€” and without identifying the correct cause, it's easy to spend money on parts that aren't the problem.

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If your engine warning light is flashing โ€” not just on solid โ€” this is an active misfire happening right now. Ease off the throttle. Continued hard driving risks damaging your catalytic converter, which is an expensive component to replace.

Don't Guess โ€” The Wrong Fix Costs More

โš ๏ธ This symptom could mean several different things
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Several different components can cause identical misfire symptoms
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The most likely cause depends on your vehicle's exact age, mileage and fuel type
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Replacing the wrong part first is extremely common โ€” and expensive
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An active misfire can damage other components if left unaddressed

What's Causing It โ€” Specific To Your Car

The exact cause depends on your make, model, year, mileage and full symptom picture. Your MotorLoom report identifies the most likely faults for your specific vehicle โ€” ranked by probability.

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Your Personalised Diagnosis Includes:
Most likely cause of the misfire for your exact vehicle
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Which cylinder or system is most probably at fault
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UK repair costs โ€” independent garage vs main dealer
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Whether it's safe to drive or needs immediate attention
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Garage questions to avoid unnecessary parts replacement
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MOT risk and emissions impact
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Specific to your exact vehicle ยท Delivered in under 60 seconds
Personalised Diagnostic Report

Find Out Exactly What's Wrong

Tell us about your vehicle and symptoms. We'll identify the most likely causes and tell you what it should cost to fix โ€” before you go anywhere near a garage.

Likely causes ranked by probability for your car
UK repair costs โ€” independent garage & main dealer
Urgency rating โ€” safe to drive or act now?
MOT risk assessment
Word-for-word questions to stop garages overcharging
Printable report to take with you
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Common Questions

A mild misfire may be driveable short-term, but a flashing engine light means stop pushing the engine. Your report includes a specific urgency rating for your vehicle.
An active misfire causes the engine management light to illuminate โ€” which is an automatic MOT failure. It also typically causes emissions test failure. Your report covers this in full.
Some misfires have straightforward fixes โ€” but only if you know exactly what's causing it. Your report identifies the likely cause so you know what you're dealing with before spending anything.
It varies significantly depending on the cause and your vehicle. Your report gives you a realistic UK cost breakdown for each likely fault.

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