Question about 1991 Peugeot 405
Most likely the ECU (Engine Computer Unit) is responding to some duff sensor / loose cable / whatever ..
All modern engines have more sensors than you can shake a stick at, some positioned in the most inaccessible places, that can cause the most obscure problems imaginable (remember the Oxygen Sensor in the Exhaust manifold that was 'poisioned' by some dufff supermarket petrol ??)
It's a Peugeot garage computerised diagnostics job I'm afraid...
Posted on Feb 10, 2009
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Posted on Jan 02, 2017
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