Vauxhall zafira misfire cure coilpack

How to diagnose and replace a faulty coil on a Vauxhall Opel zafira. If you don’t have a code reader then check your plugs, if you’re gonna go to that trouble then why not just change them. They’re cheap. If the misfire persists then fit a coil pack because 90% it’ll be that.
The OBD light will reset itself after a drive if the only code was misfire. Usually I don’t just swap parts to fix a fault but coil packs don’t give a specific code . Just misfire and the cylinder number. If the misfire goes away then the light resets on its own, it did on this car. By changing the plugs and coil you’ve eliminated the most likely cause, and you’ve got something for your money rather than spending that on diagnostics and the garage changing the plugs and coil and adding retail parts cost to the job. If you’re a novice you can do this. Just don’t tighten the plugs too much. Half a turn from when they settle on the washer is enough.