Focus engine light.

[marjan]

The engine warning lamp has come on on my Ford Focus after I changed the air filter and forgot to reconnect the wiring back to the airbox sensor. I have reconnected the sensor but the warning light will not go out, is there a way to reset it without paying through the nose at a dealer?.

[Terranosaurus]

Usual procedure with many ECU's is to disconnect the battery for anything from 10 min to 24hrs.

[marjan]

Cheers Simon but for some reason it has cleared itself today - very strange  :? :? :?

[Terranosaurus]

Some of them have limited memory and pure themselves after so many starts I know mine does it after 50 with the nissan management.