Choose the symptom or technical question that matches your enquiry. These 50 articles explain what to record, how to interpret the evidence and when specialist assessment is appropriate. They do not replace vehicle-specific repair instructions.
All diagnostic collections · Vehicle and module finder
Driver assistance and calibration evidence
- Driver-Assistance Camera Reports Poor Visibility on a Clear Day
- Adaptive Cruise Control Cancels When the Brake Lights Flicker
- Lane Assistance Pulls Differently After Tyres Were Changed
- Parking Camera Image Is Clear but Guide Lines Are Missing
- Parking Sensor Warning Appears After Bumper Painting
- Radar Cover Was Replaced with an Aftermarket Trim Piece
- ADAS Calibration Fails Before the Measurement Stage
- Successful ADAS Calibration Still Needs the Repair Scope Explained
- Blind-Spot Warning Lights Stay On with No Nearby Vehicle
- Driver Monitoring Warning Persists After the Seat Position Changes
Transmission data and repair scope
- Transmission Input Speed and Engine Speed Are Not Always Identical
- Gearbox Adaptation Values Need the Correct Units and Limits
- Transmission Pressure Requested and Actual Values Diverge
- Gearbox Slip Reported Only During One Specific Shift
- Gearbox Learning Routine Finishes but Shifts Remain Harsh
- TCU Temperature Reading Is Implausible Before the First Start
- Gearbox Fault Follows a Missing Wheel-Speed Signal
- Transmission Software Identification Does Not Match the Replacement Invoice
- Automatic Transmission Warning with No Gearbox Codes on a Basic Reader
- Transmission Repair Report Should Separate Electronics from the Whole Gearbox
EV thermal management and verification
- EV Battery Preconditioning Does Not Activate Before a Rapid Charge
- EV Cooling Warning Appears During Rapid Charging but Not Driving
- EV Cabin Heater Works but Battery Preconditioning Remains Unavailable
- EV Air-Conditioning Service Followed by High-Voltage Warnings
- EV Thermal Valve Command Changes but Temperatures Do Not
- EV Coolant Level Falls Without a Visible Puddle
- EV Heat Pump Noise Changes During Defrosting
- EV Cooling Fan Is Silent During a Workshop Check
- EV Heater Warning Returns After a Low-Voltage Battery Repair
- EV Thermal-System Repair Needs Charging and Driving Verification
Choosing and preparing module repair
- Deciding whether to repair or replace a faulty ECU
- Module Exchange Service and Keeping the Original Data
- A Used ECU Seller Says It Is Plug and Play
- Module Warranty and an Unresolved Vehicle Wiring Fault
- Checking a customer-supplied module before fitting it
- Module Was Previously Opened by Another Repairer
- Identifying a module when its label is missing
- Sending Two Similar Modules in One Parcel
- Repair Enquiry for a Vehicle Already Dismantled
- What to send for a second opinion on an ECU diagnosis
Service history and post-repair evidence
- Post-Collision Electrical Scan Needs the Pre-Repair History
- Electrical Assessment After a Vehicle Has Been Stored for Months
- Checking the wiring around rodent damage
- Electrical Fault After an Engine Was Removed and Reinstalled
- Electrical Warnings After a Dashboard Replacement
- Fault Returns Only After the Customer Reconnects an Accessory
- A Repair Works in Dry Weather but Fails Again in Rain
- A Road-Test Report Should State Whether the Original Fault Was Reproduced
- Keep Original Fault Data Before a Courtesy Code Clear
- Building a Vehicle Electronics Service History for Future Repairs
Need help choosing the next step?
Describe your fault or explore the main repair library. Confirm scope and arrangements before booking or dispatch. Workshop assessments take place in Didcot; suitable removed-module enquiries are welcome from across the UK.