Saved £865
★★★★★
Daniel · London
Ford Fiesta 2016
Engine shaking
John found: Loose ignition coil causing misfire
“John spotted the issue in minutes — other garages wanted to replace half the engine.”
Garage quoted: £950Fix: £85
Car Diagnostic no appointment
in a garage near me
Lucy
Don't get ripped off! Get a car diagnostic before visiting the garage!
30 Years as a Reliable and Trustworthy Mechanic - now online
Lucy
Don't get ripped off! Get a car diagnostic before visiting the garage!
Jenna
Pay what is fair, not what they ask you to. John will tell you.
Mike
Know how much for the parts and how much the labor costs in the garages near you.
John Mechanic
I'm John, the garage guy. And what I do is easy: I save you a lot of money.
John Mechanic
How? I help you diagnose your car for free. I help you compare cars to buy. I show you tricks and info so you get the most out of your car. You'll be known as Da Car Master after asking me a few questions.
John Mechanic
I can also help you buy the right car. Or understand the right finance... without selling you anything. That should give you confidence because I'm not getting anything from it... just your trust. But I can help you understand the different purchasing options to match what you want, need and can afford.
John Mechanic
To get my help: Ask me questions. Show me some pictures. Or pull your car details for free from the DVLA records.
John Mechanic
Pick your problem to start
Quick car diagnostic without appointment in the car garage near me.
The information shown on this site can not replace an in-person consultation, expert repair, or professional advice, but it will give you a level of knowledge to chose the right expert, save money and make informed decisions.
What John's Diagnosed
Real UK drivers. Real savings. No exaggeration.
Saved £1,100
★★★★★
Sarah · Manchester
Vauxhall Corsa 2018
Steering warning light
John found: Low power steering fluid and sensor reset
Garage quoted: £1,200Fix: £100
Saved £1,350
★★★★★
Mark · Birmingham
Volkswagen Golf 2015
Engine rattle
John found: Loose heat shield
Garage quoted: £1,400Fix: £50
Saved £1,680
★★★★★
Olivia · Leeds
Ford Focus 2014
Hard gear shifting
John found: Worn clutch cable adjustment
Garage quoted: £1,800Fix: £120
Saved £520
★★★★★
Ahmed · London
Nissan Qashqai 2017
Parking sensor failure
John found: Dirt buildup and wiring issue
Garage quoted: £600Fix: £80
Saved £1,940
★★★★★
Emma · Bristol
BMW 3 Series 2013
Engine warning light
John found: Faulty vacuum hose
“John diagnosed it in one session. Saved me nearly £2,000.”
Garage quoted: £2,000Fix: £60
Saved £830
★★★★★
Tom · Sheffield
Vauxhall Astra 2015
Suspension noise
John found: Worn anti-roll bar link
Garage quoted: £900Fix: £70
Saved £220
★★★★★
James · Liverpool
Ford Fiesta 2012
Headlight failure
John found: DIY bulb replacement guide
Garage quoted: £250Fix: £30
Saved £180
★★★★★
Rachel · Glasgow
MINI Hatch 2016
Battery drain
John found: Boot light stuck on, draining battery overnight
Garage quoted: £200Fix: £20
Saved £690
★★★★★
Peter · Nottingham
Volkswagen Polo 2019
Brake warning light
John found: Worn sensor wire
Garage quoted: £750Fix: £60
Saved £850
★★★★★
Chloe · Leeds
Audi A3 2017
AC not cooling
John found: Refrigerant refill needed
Garage quoted: £1,000Fix: £150
Saved £500
★★★★★
David · London
Ford Focus 2016
Water leak inside the car
John found: Blocked drainage channels
Garage quoted: £550Fix: £50
Saved £700
★★★★★
Ben · Reading
Mercedes C-Class 2014
Engine overheating
John found: Thermostat failure
Garage quoted: £850Fix: £150
Saved £300
★★★★★
Laura · York
Nissan Qashqai 2019
Rear camera not working
John found: Software reset resolved the fault
Garage quoted: £350Fix: £50
Saved £820
★★★★★
Michael · Coventry
Vauxhall Corsa 2013
Engine misfire
John found: Spark plugs needed replacing
Garage quoted: £900Fix: £80
Saved £240
★★★★★
Sophie · London
BMW 1 Series 2018
Window not working
John found: Blown fuse — simple replacement
Garage quoted: £300Fix: £60
Saved £1,150
★★★★★
George · Leicester
Volkswagen Golf 2016
Fuel smell inside car
John found: Loose fuel cap seal
Garage quoted: £1,200Fix: £50
Saved £350
★★★★★
Hannah · Edinburgh
Toyota Yaris 2015
ABS warning light on
John found: Dirty wheel speed sensor — cleaned and reset
Garage quoted: £400Fix: £50
Saved £900
★★★★★
Robert · Birmingham
Ford Focus 2018
Car pulling left
John found: Wheel alignment out of spec
Garage quoted: £950Fix: £50
Saved £200
★★★★★
James · London
Nissan Juke 2016
Engine hesitation and sluggish acceleration
John found: Clogged air filter restricting airflow
Garage quoted: £250Fix: £50
Saved £320
★★★★★
Katie · Cambridge
Volkswagen Golf 2014
Battery replacement quoted at £450 by garage
John found: DIY battery replacement guide — correct spec battery
Garage quoted: £450Fix: £130
Saved £300
★★★★★
Paul · Leeds
Ford Fiesta 2017
Dashboard warning light
John found: Sensor recalibration — no parts needed
Garage quoted: £350Fix: £50
Saved £550
★★★★★
Daniel · Oxford
Audi A4 2016
Brake noise
John found: Worn brake pads only — not discs
Garage quoted: £700Fix: £150
Saved £280
★★★★★
Megan · Brighton
MINI Cooper 2015
Boot not opening
John found: Boot actuator fault — repaired rather than replaced
Garage quoted: £350Fix: £70
Saved £860
★★★★★
Andrew · London
Vauxhall Astra 2017
Airbag warning light
John found: Loose seat connector under front seat
Garage quoted: £900Fix: £40
Quick Car Diagnostic without appointment in a garage near me — By Make & Problem - Like the garage near me but better
John has diagnosed car problems across the UK — from Ford Fiesta engine misfires in London, to Vauxhall Corsa steering faults in Manchester, VW Golf engine rattles in Birmingham, and BMW warning lights in Bristol. Whatever your car make, John starts from the most likely cause and walks you through it step by step — before you spend anything.
Common UK car problems John diagnoses every day: engine warning lights, ABS faults, suspension noises, brake warnings, AC not cooling, battery drain, water leaks inside the car, and cars that won't start. Most turn out to be simpler — and far cheaper — than garages quote.
John Mechanic
30 Years Experience
From small independents in Manchester to busy main dealers in London — 30 years diagnosing UK cars.
Successful Car Diagnostics by car make
The information shown on this site can not replace an in-person consultation, expert repair, or professional advice, but it will give you a level of knowledge to chose the right expert, save money and make informed decisions.
Testimonials are based on real quick car diagnostics. Results and savings may vary depending on vehicle condition, location, and repair provider. Content is provided for informational purposes only and does not replace professional mechanical inspection.