17A Lancaster Rd, Penfield Estate, Uxbridge, Middlesex UB8 1AP
Mon - Fri: 8:30am - 5:30pm | 01895 236567
Professional engine diagnostic scanning at our Uxbridge workshop. Engine management lights, limp mode, rough running, loss of power — we read the codes, analyse live data, and find the real cause. Serving Uxbridge, Hayes, Hillingdon, Ruislip, Yiewsley and West Drayton.
Engine Diagnostics Uxbridge
Modern vehicles contain dozens of electronic control modules, each monitoring sensors and actuators across the engine, transmission, brakes, suspension, emissions, and safety systems. When a fault is detected, a code is stored — but the code is a starting point, not a diagnosis. The same fault code can be caused by several different underlying problems.
At Courtwood Car Services in Uxbridge, our technicians use professional multi-brand diagnostic equipment to read all stored fault codes, analyse live sensor data in real time, and identify the actual root cause — not just the code. This prevents expensive misdiagnosis and unnecessary parts replacement.
Diagnostic Services
We carry out full multi-system diagnostic scans on all petrol and diesel vehicles at our Uxbridge workshop.
Fault code reading and live data analysis across the engine management system — sensor readings, fuelling, ignition, turbocharger, EGR, DPF, and emissions control systems. Petrol and diesel.
ABS module fault code reading, wheel speed sensor testing, and hydraulic pump diagnosis. We identify whether an ABS warning light indicates a sensor, wiring, or module fault.
Airbag and Supplemental Restraint System (SRS) fault reading. Clock spring, seat belt pretensioner, and airbag module faults. An airbag warning light means the system may not deploy in a collision.
Automatic transmission and DSG/DCT gearbox fault code reading and live data. Solenoid faults, clutch pack pressure issues, selector position sensor faults, and torque converter issues.
Tyre Pressure Monitoring System (TPMS) sensor fault reading and reset. Traction control and stability control system fault code reading and live data for wheel speed and yaw sensor faults.
Beyond reading codes — live sensor data analysis and freeze frame data review to identify intermittent faults, confirm root causes, and avoid misdiagnosis through parts replacement.
Our Process
Call 01895 236567 and describe the warning light or symptom. We'll advise on urgency and book you in — same-day diagnostic slots are often available.
Vehicle connected to our professional diagnostic equipment. All stored fault codes read across all electronic modules. Freeze frame data reviewed. Live data streams monitored where needed.
Fault codes cross-referenced with live data and physical inspection where appropriate. We identify the actual underlying fault — not just the code number — and explain the findings clearly.
Written repair quote provided before any work begins. On approval, repair carried out and fault codes cleared. Vehicle rescanned post-repair to confirm all faults resolved.
Real Jobs Completed
Engine management light on with EGR valve fault code. Live data confirmed EGR stuck open causing rough idle. EGR valve cleaned and reset. Fault cleared and road tested — light remained off.
Misfire on cylinder 3, engine management light flashing. Diagnosed as failed ignition coil pack using live injector and coil data. Coil pack replaced. No further misfire on road test.
Limp mode with turbocharger fault codes. Live data showed variable vane actuator fault not a failed turbo. Actuator replaced and recalibrated. Full power restored — saved customer from unnecessary turbo replacement.
ABS and ESP lights on simultaneously. Wheel speed sensor fault on nearside rear confirmed via live data comparison of all four sensors. Sensor replaced — both lights cleared and system verified.
Why Courtwood Car Services
We use professional-grade multi-brand diagnostic equipment that accesses manufacturer-specific codes and live data streams across all vehicle systems — not the basic code readers sold in consumer shops.
Reading a fault code takes seconds. Understanding whether that code is the cause or a symptom takes experience and live data analysis. We don't just read codes — we find what's actually causing the problem.
We explain what the fault code means in plain language, what is causing it, and what the repair involves. You will never leave our workshop confused about what is wrong with your vehicle.
Every repair identified through diagnostics is quoted in writing before any work begins. You decide whether to proceed — no pressure, no surprise bills.
Based on the Penfield Estate, easily accessible from Hayes, Hillingdon, Ruislip, Yiewsley, and West Drayton. Same-day diagnostic appointments often available.
Consistently praised for accurate diagnosis, honest advice, and avoiding unnecessary parts replacement — the qualities that matter most when your car has an unexplained warning light.
Diagnostic Service Information
Our diagnostic service covers connecting professional equipment, reading all fault codes across all modules, analysing live data, identifying the root cause, and providing a clear explanation and written repair quote. Call 01895 236567 to arrange your appointment.
| Service | Notes |
|---|---|
| Full vehicle diagnostic scan | All modules — engine, ABS, airbag, transmission |
| Live data analysis | Included where fault requires investigation |
| Freeze frame data review | Included as part of diagnostic process |
| Written repair quote | Provided after diagnostic — no obligation |
| Post-repair rescan | Included after repair to confirm fault cleared |
Call 01895 236567 to book your diagnostic appointment — Monday to Friday, 8:30am to 5:30pm.
Opening Hours
| Day | Opening Hours |
|---|---|
| Monday | 8:30am – 5:30pm |
| Tuesday | 8:30am – 5:30pm |
| Wednesday | 8:30am – 5:30pm |
| Thursday | 8:30am – 5:30pm |
| Friday | 8:30am – 5:30pm |
| Saturday – Sunday | Closed |
17A Lancaster Road, Penfield Estate, Uxbridge, Middlesex UB8 1AP
Call 01895 236567Customer Reviews
"Had an engine management light on my BMW. Three other garages just cleared the code without fixing anything. Courtwood actually diagnosed the root cause — an EGR fault — fixed it properly. Light has stayed off ever since."
"My Ford went into limp mode. Courtwood booked me in same day, diagnosed a turbo actuator fault rather than a failed turbo, and saved me from a very expensive unnecessary repair. Honest and knowledgeable team."
"ABS and ESP lights came on together. Courtwood diagnosed a rear wheel speed sensor in minutes using live data. Part ordered and fitted same day. Both lights cleared. Excellent service."
"Flashing engine management light on my petrol. Courtwood diagnosed a misfire on cylinder 2 — coil pack failure. Fixed within a couple of hours. Explained everything clearly. Really happy with the service."
"Used Courtwood for a pre-purchase diagnostic on a used car I was buying. They found a hidden transmission code the seller didn't know about. Saved me from a very costly mistake. Highly recommend."
"Diesel van had black smoke and poor power. Courtwood ran a full diagnostic, identified an injector balance rate fault on one injector. Fixed and retested. Van running better than it has in months. Highly recommend."
Frequently Asked Questions
Find Us
Courtwood Car Services is at 17A Lancaster Road, Penfield Estate, Uxbridge, Middlesex UB8 1AP. Easy to reach from Hayes, Hillingdon, Ruislip, Yiewsley, and West Drayton. Free parking on site.
| Address | 17A Lancaster Road, Penfield Estate, Uxbridge, Middlesex UB8 1AP |
| Phone | 01895 236567 |
| info@courtwoods.co.uk | |
| Hours | Mon–Fri 8:30am – 5:30pm |
| Google Maps | Get Directions |
Areas We Serve
Drivers from across West London and the UB and HA postcode areas bring their vehicles to Courtwood Car Services for professional engine diagnostics.
Related Services
Professional OBD scan. Live data analysis. Root cause identified — not just the code. Written quote before repair.