MotorSector Streatham · Streatham, SW16 5LU

Auto-electrical and advanced diagnostics

Q: Why does electrical diagnosis take time?

Intermittent faults, damaged wiring and network problems may require measurements at several points and testing under the conditions that trigger the fault.

Q: Can you program replacement modules?

Some coding and adaptation functions are supported, depending on make, model, security access and component type.

Q: What causes a battery to drain overnight?

Possible causes include a failing battery, charging fault, module that does not shut down, wiring issue or accessory drawing current.

Q: Can you diagnose hybrid and EV systems?

MotorSector lists hybrid and EV diagnostic capability. Confirm the exact vehicle and high-voltage work required before booking.

Modern vehicles rely on interconnected control modules, sensors and wiring networks. MotorSector combines system scans, electrical measurements and component testing to find faults that a simple code read may not explain.

Call 020 3981 1781

Auto-electrical diagnostic testing in the workshop

WorkshopAuto-electrical diagnostics

Inspected, estimated and approved before work begins at our Streatham workshop.

Common reasons to book

Battery repeatedly goes flat
Several warning lights appear together
Electrical equipment works intermittently
Vehicle will not start despite a healthy battery
A module will not communicate during diagnostics
Fuses repeatedly fail

What MotorSector can help with

Battery, alternator and starter testing
Parasitic battery-drain investigation
Lighting, wiper, window and locking faults
Fuse, relay, wiring and earth-point diagnosis
CAN-bus communication fault tracing
Module coding, resets and software functions where supported
DPF, EGR and AdBlue system diagnostics

How the process works

01
Vehicle is booked
02
Vehicle is inspected or tested
03
Findings are documented
04
Estimate is supplied
05
Customer approves work
06
Repair is completed
07
Final paperwork is provided

Why choose MotorSector

AA Approved Garage
IMI-qualified technical capability
Advanced diagnostic equipment
Video inspections where appropriate
Clear approval process
Quality parts
Parts and labour guarantee where applicable
Streatham workshop

Relevant trust marks

Only marks that apply to this service are shown. Click a logo to read a short explanation.

IMI

Technical work is supported by IMI-qualified capability. The Institute of the Motor Industry sets professional standards for automotive technicians and workshop competence.

Learn more

Frequently asked questions

Why does electrical diagnosis take time?

Can you program replacement modules?

What causes a battery to drain overnight?

Can you diagnose hybrid and EV systems?

Ready to book?

Book online through our workshop booking system, request a quote, or call the Streatham team.