Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Ignition system, servicing
General notes on ignition system
- Only the components which specifically relate to the ignition system are dealt with here. The other components of the injection and ignition system, refer to Fuel injection system, servicing .
- For trouble-free operation of the electrical components a voltage of at least 11.5 V is necessary.
- During some checks it is possible that the control module will detect and store a malfunction. Therefore after completing all checks and repairs the Fault memory must be checked and if necessary erased.
Ignition system components - assembly overview for engine code BJS, refer to Ignition system components, assembly overview
Ignition coils with power output stages, removing and installing, refer to Ignition coils with power output stage, removing and installing
Safety precautions, refer to Safety precautions
Test Data, Spark Plugs, refer to Technical data, spark plugs
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.