Intermittent fault investigation in
Slough.
The faults that come and go. Never code at the dealer. Never repeat on the cold morning the diagnostic appointment was booked. We hunt them down properly at our Slough workshop. No nonsense. No hidden prices. Book in today.
⭐⭐⭐⭐⭐ 4.9 out of 5 from 500+ Google reviews. Trusted by drivers across Slough since 2019
- ✓6 months interest-free, up to £3,000
- ✓Same-day slots available in Slough
- ✓Dealer-level scanners across every make
Intermittent Fault Investigation in Slough. The Hard Ones
Most diagnostic appointments are an easy day. The car has a stored fault, the scanner reads it, the part gets ordered, the job gets done. This page is for the other ones. The misfire that only happens at 4000rpm in third gear when the engine is warm. The dash that lights up Christmas tree once a week and clears itself. The car that goes into limp mode on the M4 and is fine again by the time you get to the dealer. Those are the faults we book in for multi-day investigation at our Slough workshop.
Intermittent faults are not magic, they are just hard. They need data logging, loaded oscilloscope tests, repeated road tests in the conditions that trigger them, and a tech who will not give up after the first reset. We take them on. Berkshire owners send us cars the dealer told them they could not reproduce.
How we approach an intermittent fault at Onyx Slough
- Full freeze frame data on every stored code. even cleared codes leave a trail. The engineering layer of dealer tools shows what was happening when the fault triggered
- Long-form drive cycle data logging. we leave a logger plugged in and drive the conditions you described. Cold start, motorway cruise, stop-start traffic, school-run short hops, whatever triggers it
- Oscilloscope on the relevant circuits. intermittent crank sensor, cam sensor, lambda, MAF and ABS sensor failures show as glitches on a scope that a code reader will never see
- Wiring loom inspection at known weak points. rear of cylinder head looms (BMW), tailgate hinge looms (Mercedes, Audi), boot lid looms (VAG), engine harness chafe points
- Honest report at every milestone. we will not silently rack up diagnostic time. You get an update before each chunk of investigation, with the cost so far and the next step
Faults we actually solve every week
Intermittent misfires on N54 and N55 BMWs traced to ignition coil micro-cracks (rather than the obvious blanket coil change). Random cluster blackouts and check engine lights on Audi A5 and Q5 traced to a chafe in the engine bay loom. Mercedes E and S class boot warnings traced to broken loom strands in the hinge. Intermittent ABS faults on Range Rover Sport traced to wheel speed sensors that read fine static and glitch at speed. Intermittent VW DSG warnings traced to mechatronic temperature drift. Each one a different car, a different week, all booked through this page at our Berkshire workshop.
When we will tell you to stop spending
Diagnostic investigation has a sensible ceiling. If we have spent six hours on a fault, eliminated the obvious causes and the next step is a a fair amount module on a hopeful punt, we will tell you straight before you authorise it. Sometimes the right call is to live with an intermittent fault that is not safety related rather than throw more money at it. Honest engineering. We will give you the information you need to make that call, not push more parts on an open chequebook.
Where we are and who we cover
Intermittent fault investigation for drivers across Slough, Langley, Colnbrook, Datchet, Windsor, Maidenhead, Uxbridge and Gerrards Cross. The Berkshire workshop that takes on the difficult ones, five minutes from M4 J5 at SL3 7EW.
Got a fault nobody else can pin down? Call 01753 439115 or WhatsApp the Onyx Autocentre team on 07393 580281 with what you have observed and the conditions that trigger it and we will book a proper investigation. 01753 439115 or WhatsApp 07393 580281.
Intermittent Fault Investigation in Slough. The Hard Ones in Slough and across Berkshire
Onyx Autocentre is based in Slough, Berkshire and we look after cars from across the SL postcodes every day. Whether you're driving in from central Slough, Burnhamor Taplow, we'll book your intermittent fault investigation in slough. the hard ones around your schedule. Same Slough workshop, same trusted team, same standard on every intermittent fault investigation in slough. the hard ones job.
All our services
Every service we offer at our Slough workshop. Tap a tile to find out more.
- Air Bag RepairsFind out more
- Alloy Wheel Crack WeldingFind out more
- Alloy Wheel RefurbishmentFind out more
- Alloy Wheel WeldingFind out more
- Auto ElectricsFind out more
- Body Kit FittingFind out more
- Boost Leak & Smoke TestFind out more
- CambeltsFind out more
- Car Air ConditioningFind out more
- Car BatteriesFind out more
- Car BrakesFind out more
- Car ExhaustsFind out more
- Car ModificationsFind out more
- Car RepairsFind out more
- Car Safety ChecksFind out more
- Car ServicingFind out more
- Car TyresFind out more
- Carbon CleaningFind out more
- Cheap Car TyresFind out more
- Clutch ReplacementFind out more
- Diesel Performance ECU TuningFind out more
- Diesel TuningFind out more
- Dyno TestingFind out more
- ECU RemappingFind out more
- Engine DiagnosticsFind out more
- Engine ManagementFind out more
- Engine RebuildsFind out more
- Engine TuningFind out more
- Fleet MaintenanceFind out more
- Gearbox ServicingFind out more
- Gearbox TCU RemappingFind out more
- Haldex ServicingFind out more
- Head Gasket RepairsFind out more
- In-Car EntertainmentFind out more
- Mechanical RepairsFind out more
- MOT Failure RepairFind out more
- Nitrogen Oxide (NOx) Sensor RepairsFind out more
- Number PlatesFind out more
- Oil & Filter ChangeFind out more
- Parking SensorsFind out more
- Powder Coating for Alloy WheelsFind out more
- SteeringFind out more
- SuspensionFind out more
- Timing Belt ReplacementFind out more
- Trade Alloy Wheel RepairFind out more
- Turbo Intake CleaningFind out more
- Van Repairs & ServicingFind out more
- Vehicle SecurityFind out more
- Wet Belt ReplacementFind out more
- Wheel BalancingFind out more
- Window TintingFind out more
What Our Customers Say
Rated 5 Stars on Google by drivers across Slough and Berkshire
"Took my BMW here for an oil change and oil filter and the service was spot on. Really friendly team, got the car booked in quickly and the job was done properly with no hassle."
"Highly recommend this garage. After contacting a few other garages who didn't want to take my car in for diagnostics, these guys were happy to help. They diagnosed and fixed an engine fuel leak issue professionally and efficiently. Great service and very reliable. I'll definitely use them again."
"Very nice experience at Onyx — they took me in immediately and completed the DRL module swap efficiently. I have no regrets and would highly recommend."
"I brought my car to Onyx after visiting many other mechanics who failed to sort out issues with my vehicle. The mechanics here clearly explained the issues with the vehicle and fixed them quickly. Amazing service and wonderful people, highly recommend."
"These guys are always polite and welcoming. I've taken multiple vehicles here and the service received has been excellent."
"Had the front pads done here over the weekend. Second time in with Onyx and service has been top notch both times. On time, no hassle and cost effective. Highly recommend."
"Max and Ben are extremely professional and did an excellent repair on my wife's car at a great price. Max spotted the problem within 6 hours, which 2 other garages could not detect."
"I took my car to Onyx and met Ben who was friendly and I got the problem diagnosed by Ben which I had a faulty water pump. I was quoted a reasonable price and got it replaced. I was satisfied and would recommend Onyx."
"Great service, sorted out my alloy refurb at a good price and quick turnaround. Top service, highly recommend."
"A great experience with Onyx who fitted a new clutch for my Fiat 500. Super quick, friendly and well priced. Would highly recommend."
"Very friendly, no hassle effective service. Definitely recommend and will use when I need to get my alloy wheels refurbished."
"Brought my Audi S3 in for a coolant leak — the part was on back order but they managed to source one in a couple of days. Massive thanks to Ben."
"My vehicle went in for a brakes job and Ben and the team at Onyx Autocentre did an amazing job. Highly recommended."
Spread the cost over 6 months, interest-free.
Big bill? Pay the first instalment when you book, then spread the rest across up to 5 more monthly instalments, interest-free. Available on jobs up to £3,000. No setup fees, no hidden interest. FCA-authorised through Payment Assist, soft credit check, decision in minutes.
- ✓ Up to 6 months interest-free
- ✓ Available on jobs up to £3,000
- ✓ First payment at booking, rest split monthly
- ✓ Soft credit check, decision in under 2 minutes
- ✓ No setup fees, no hidden interest
Same-day slots are limited this week.
Call or WhatsApp now and get intermittent fault investigation in slough. the hard ones today. Slough, Langley, Colnbrook, Windsor, Maidenhead, Uxbridge and Gerrards Cross.