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Why do the warning lights keep flickering on my 1991 Peugeot 405?

My 1991 Peugeot 405 has recently been displaying the STOP and warning lights intermittently on the dashboard. This only happens after I do long distance driving, but have to slow down e.g. a slower car ahead. As soon as I put my foot on the brakes, the light begins to flash intermittently. If I am operating the ventilation it's a bit more. Any electrical gadget that I add (headlights or wipers) or is added automatically (like radiator fan) increases the flashing. The engine doesn't show any tendency to go off though. As soon as I rev the engine to start moving again the flashing stops. My plugs seem okay because I experience no jerking when I drive. This does not happen during town driving. From all I've observed, it seems to be a power issue. Can this be a leaky plug wire or a faulty distributor rotor?

Asked on 14 August 2017 by kumah

Answered by Keith Moody
This is one of those annoying electrical faults that often happen to cars of this era. Try checking the connection to the temperature sender and/or looking for faulty relays (they're located behind the grille). It could also be down to faulty idle valve if the engine feels like it's going to cut out.
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