check all the way along the bulkhead, it comes from the engine loom, over through the bulkhead under the abs unit, you should also have a purge valve by the power brake unit, connected to the carbon canister under the o/s wing.... via a vaccum hose

maybe, your car has had an older loom fitted,which didnt have a lambda....take the ecu plug off and make sure pins 1 and 2 are present and wired up.... one of these is lambda signal,cant remember which,,,,1 iirc








you can never assume a green top should use a lambda sensor, most tuners dont utilise closed loop,so its not needed when chipped....just like older L8 4x4s...