Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Check Engine (MIL) Lamp

CHECK ENGINE lamp (MIL)

Fault symptom
The lamp does not light up when the ignition is switched on. On M90- cars the lamp should go out after 2 seconds it working correctly.


Diagnostic procedure




1 Check the power supply
- Ignition switch in ON position.
- Select command code 452 with the ISAT scan tool.

Lamp flashing?
YES Continue fault diagnosis of the LH system. LH System Diagnostics
NO Continue fault diagnosis for "EDU" or "indicator lamp 47P".