Power positions
Checks accessible accessory, ignition and start outputs for intermittent or missing supply.
SP88 · South London & Surrey
Ignition Switch Diagnosis & Replacement in South London
Mobile diagnosis for intermittent ignition power, no-crank symptoms and key-position faults, with battery, starter and immobiliser causes checked first.
The switch, lock barrel and immobiliser are different parts
A key that will not turn can involve the mechanical barrel; a no-crank fault may involve the battery or starter; and a security warning can involve the key or immobiliser. The electrical ignition switch is only one possible cause.
Mechanical operation
Key movement, steering-lock behaviour and the connection between barrel and switch are considered.
Starting system
Battery voltage, starter command and immobiliser evidence help prevent an incorrect switch replacement.
Safety first: An engine that cuts out because ignition power is lost can remove assistance and lighting functions. Do not keep driving an intermittently stalling vehicle. No bypass or security defeat is offered.
How SP88 approaches the job
Record the fault
Confirm which key position or vehicle function fails.
Test the circuit
Separate battery, starter, relay, wiring and immobiliser causes from the switch.
Identify the component
Confirm electrical switch, barrel assembly or integrated steering-lock design.
Replace or refer
Fit the supported matched component, or explain when coding or specialist security work is required.
What replacement includes
- Diagnosis of accessible ignition-switch inputs and outputs.
- Suitable electrical switch replacement when confirmed and separately serviceable.
- Checks of starting response and accessory/ignition functions after fitting.
- Clear advice if the barrel, steering lock, key recognition, programming or control module is the actual issue.
Ignition systems vary from separate electrical switches to coded electronic steering locks and start buttons. No key or module compatibility is assumed.
Mobile or workshop?
Many electrical-switch tests and accessible replacements are mobile-suitable. Key coding, immobiliser programming, locked steering systems or specialist security parts may require referral or workshop support.
Areas covered
Wallington, Sutton, Carshalton, Croydon, Purley and nearby South London and Surrey areas, subject to access and job suitability.
Related SP88 services
Use the established service page that best matches the fault rather than guessing a part.
Questions customers ask
Can a bad ignition switch stop the engine cranking?
Yes, but battery, starter, relay, wiring and immobiliser faults are also common, so the start command should be tested.
Does replacing the switch mean I need new keys?
Not always. A separate electrical switch may retain the existing barrel and keys; integrated security assemblies can require coded parts and programming.
Can SP88 bypass the immobiliser?
No. SP88 diagnoses compliant starting and electrical faults and does not advertise security-system bypasses.