Autodata Technical Issue 7 - Electrical Fault on Mercedes A180
Each month the Autodata team answers a common technical question and provides a printable document with technical diagrams to download and keep, exclusively for IGA members.
Issue 7 solves an electrical fault on a 2012 Mercedes A180 that is keeping its engine malfunction indicator lamp on as well as trouble codes.
Q. We are having problems diagnosing an electrical fault on a 2012 Mercedes A180 1,6. The engine malfunction indicator lamp is on and there are various trouble codes in the fault memory. We have carried out several component checks and they are functioning correctly. Has anyone reported this before?
A. Yes, this problem affects several Mercedes-Benz models with 270.910/270.920 engine codes and is due to the engine wiring harness chafing on a retaining clip near the air filter housing (Fig 1.1).
Check the engine wiring harness for damage and repair or replace as necessary. Secure the engine wiring harness with a modified retaining clip (Fig 1.2). After the repair, erase all stored trouble codes.
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