Auto Electrical Repairs in Sunbury-on-Thames
Modern vehicles contain dozens of control modules communicating over networks. Electrical faults can be intermittent and confusing — multiple warnings at once, batteries going flat, features working only sometimes.
We trace electrical faults methodically using dealer-level diagnostics, wiring diagrams and meters.
Common signs
Symptoms worth checking
- Battery repeatedly going flat
- Multiple warning lights at once
- Intermittent features or modules
- Communication fault codes
- Water ingress-related faults
How we approach electrical faults
Parasitic drains are measured with the car asleep. Network faults are traced module by module. Sensor faults are verified with live data and wiring tests.
Several warnings at once often point to a single cause — low voltage, a network fault or a ground issue.
What we check
- Battery and charging system
- Parasitic drain testing
- Network and module communication
- Wiring, connectors and grounds
- Sensors
What we can do
- Drain diagnosis
- Wiring repairs
- Sensor replacement
- Module diagnosis and programming where required
How it works
The process
- 01
Describe when faults occur.
- 02
Scan and test.
- 03
Trace the cause.
- 04
Repair and verify.
Why The Factory
Main-dealer capability, independent service
A Master Technician-led workshop with seven mechanical ramps, a dedicated MOT ramp and dealer-level diagnostics. Faults are shown to you and additional work is quoted before it goes ahead.
We stand behind the work we carry out. Parts and workmanship are covered in accordance with your statutory rights and any applicable manufacturer or supplier warranty. Please ask us for details relevant to your repair.
- BMW ISTA and multi-brand platforms
- Module coding and programming capability
Free local collection & return
Available by arrangement within approximately five miles of our Sunbury-on-Thames workshop. Further afield? Just ask us.
FAQs
Auto Electrical Repairs: your questions answered
Why does my battery keep going flat?
A failing battery, charging fault or a parasitic drain from a module not sleeping.
Can you diagnose intermittent electrical faults?
Yes. Details about when it happens help us reproduce it.
Why are multiple warning lights appearing at once?
Often low voltage, a network fault or a shared sensor/ground issue.
Can you diagnose wiring and sensor faults?
Yes, using wiring diagrams, meters and live data.
Can you diagnose modern vehicle control modules?
Yes, with dealer-level diagnostic equipment.
Related services
Battery Replacement
12V battery testing, replacement and registration where required.
Alternator Repairs
Charging system testing and alternator replacement.
Vehicle Diagnostics
Dealer-level fault finding — not just reading and clearing codes.
Vehicle Coding
Module coding and programming after repairs and replacements.
Need help with auto electrical repairs?
Send your registration and a quick description on WhatsApp, or call the workshop.
The Factory, Harris Way, Sunbury-on-Thames TW16 7EL