Re: 146 - help!?!!?
It is the engine's feedback loop.
It is mounted in the exhaust downpipe which you can get to by getting under/behind the LH front wheel.
It measures oxygen in the exhaust.
Too much means it is lean, too little means that it is running rich.
They have 4 wires going in, 1 grey, 1 black, 2 white.
It looks a little like a spark plug and you need a 22mm open-ended spanner to get to it.
If you disconnect it the engine should run. The connection is above the RH head as you look from the bonnet. Look for the wire colours as there are 3 connectors there. The connector is black.