Toyota HiAce 2005 Problems

If the central locking is working via the interior switch, then it’s fair to assume that the problem is only with the exterior lock mechanism. About then, a locksmith will go looking for a faulty or deceased door actuator switch or mechanism, as this is often the cause of this condition.

But it could be a case of dirty or dry electrical contacts on the mechanism in question, too, so don’t rule that out as a first (and cheapest) possibility.

It's most likely to be an engine sensor, or a wiring connection associated with one, that's the problem. Unfortunately, intermittent problems are hard to detect, because they rarely occur when the mechanic is there to witness it.

Normally, I would be thinking it’s the turbo, but the fact the performance hasn’t been affected would suggest it’s not. Check the injectors, it could be that they’re worn and in need of replacement.