How does a faulty ignition coil cause the Check Engine Light CEL to appear on my Mercedes E-Class in Pakistan?

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How does a faulty ignition coil cause the Check Engine Light CEL to appear on my Mercedes E-Class in Pakistan?

Drivers in Pakistan frequently notice the Check Engine Light turning on without an obvious cause. Could faulty ignition coils trigger error codes related to misfires o r cylinder issues in the E-Class? How can owners confirm this, and what diagnostic tools are best suited for accurate detection?

Talha Kyanii asked on 11 Oct 2025 13:03:51 pm

1 Answer

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Gari Master - on 11 Oct 2025 13:04:46 pm

Faulty ignition coils cause misfires, which the Engine Control Unit ECU detects through sensors monitoring combustion efficiency. When the ECU senses a misfire, it triggers the Check Engine Light CEL with diagnostic trouble codes such as:

P030x codes where x is the cylinder number misfiring

Ignition coil circuit malfunction codes e.g., P035x.

In Pakistan, owners often rely on generic OBD-II scanners that may miss specific Mercedes-Benz codes. Using a Mercedes STAR Diagnostic tool o r a high-end scanner is essential to accurately diagnose ignition coil faults and pinpoint the faulty cylinder.