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OBD readiness monitors before inspection

Before an inspection it’s worth knowing whether the car has finished its emissions self-checks. Final OBD shows them as the car reports them; what it doesn’t do is guess the result of the inspection.

In short: at the MOT they plug a reader into the OBD socket and look at two things: whether there are stored faults and whether the emissions monitors are ready. Before you go, check the same yourself with Final OBD: no warning light, no pending faults and monitors finished. And do not clear faults right before you go, because the monitors are left not complete.

Open the bonnetthe in-depth explanation

What monitors are

They’re the tests the car runs on itself to keep an eye on what pollutes: the catalyst, the oxygen sensors, the fuel vapour system, the EGR or the particulate filter, depending on the car.

How to read them

Complete means the car has already run that test. Incomplete doesn’t mean there’s a fault or that someone has cleared the codes: sometimes it just needs a few more miles in the conditions that test asks for. And if a monitor shows as not supported, your car simply doesn’t have it; it hasn’t failed.

With Final OBD

The Inspection monitors screen, in Free and in Pro, looks at the emissions monitors and whether the engine warning light is on; faults have their own screen. It’s a check, not a verdict: it neither passes nor fails the car, the inspection centre does that.

Before you go

Fixing a fault is not the same as clearing it. If you clear codes, the monitors start again and the car needs a few days of driving to complete them, and permanent codes don’t go away with an ordinary clear. What gets checked depends on the car’s age and emissions standard, and the lights, brakes and tyres are checked by the centre as always.