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· Registered
331 Posts

After replacing my coolant sensor a few weeks ago my temp. gauge started going straight to max and the fans would stay on for 5 mins after engine shutdown.

After unplugging the battery for a while and also unplugging and reconnecting the ecu the problems stopped. Seems in my case the system needed to reset itself somehow.

Think i was advised this should be done by clearing codes using planet/diagbox as this removes them from both the BSI and ECU. However in my case the above did the trick.

· Registered
1,805 Posts
Diagbox is the diagnostics tool written for PSA vehicles, it should be specialist but it's readily available on ebay.

You could try a BSI reset, which scoey1001 kind of did. The correct procedure is as follows;

- Put the driver's window down, lift the bonnet and ensure all equipment is switched off.

- Ensure all doors are closed and remove key from the ignition.

- Wait for 3 minutes, disconnect the vehicle battery and wait 15 seconds.

- Reconnect the vehicle battery, wait a further 10 seconds (do not open doors.).

- Switch on the side lights through the driver's window.

- Switch on the ignition and check system's functionality.

- Hold lock button on key down for 10 seconds.

- Remove key open & close door test central locking system.

- Start the engine and complete the system's check.

Failure to follow this procedure could result in incorrect operation of many BSI related items.

· Moderator
13,429 Posts
Could be a bad contact on the relay, common fault on the 307 where dirt gets on the contacts of the relay under the bonnet slam panel.

Disconnect and give a good spray with electrical contact cleaner.
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