My engine management light was flashing every other day car was feeling rough to drive. Took it to garage they give it a diagnostics check which came up with 2 fault codes injector circuit open on cylinder 4 and cylinder 1 misfire detected so the garage advised to have a new injector fitted or possible coil pack if problem not rectified. The light is now on permanent and will be a week till the garage can fit it in. Will the car be able to be driven? Will this work rectify the problem?