Question 1

What causes an MOT emissions failure?

Accepted Answer

The most common causes are a faulty lambda (oxygen) sensor, a failed catalytic converter, an engine misfire, a clogged EGR valve, or a blocked DPF (diesel particulate filter). Accurate diagnosis is essential before any parts are replaced.

Question 2

Can I drive my car after an MOT emissions failure?

Accepted Answer

If your existing MOT certificate is still valid, you may drive the car legally while you arrange repairs. However, if the previous MOT has expired, the car should not be driven on public roads except directly to a pre-booked garage appointment.

Question 3

Do I get a free MOT retest after emissions repairs in East London?

Accepted Answer

Yes. At MnF Motors, if your car is repaired with us following an emissions failure, we carry out a free retest within 10 days of the original test date, in line with DVSA guidelines.

Question 4

How long does an emissions repair take?

Accepted Answer

It depends on the root cause. A lambda sensor swap can take under two hours. A catalytic converter replacement or DPF clean typically takes half a day. A thorough misfire diagnosis and repair may take longer. MnF Motors will give you an honest timescale after diagnosis.

Question 5

Why choose MnF Motors over a national chain for emissions repairs in East London?

Accepted Answer

MnF Motors offers 25+ years of independent expertise, a 4.9-star Google rating, and genuine one-to-one communication with the technician working on your car. Unlike national chains, we diagnose the actual cause before recommending any repair — saving you money and preventing unnecessary part replacements.