Know Your MOT

MOT failure rate and common problems for the Smc Navigator, and how to check your own car by registration.

Updated 05 September 2026.

14.5%fail rate

Smc Navigator MOT failure rate

What a Smc Navigator fails its MOT on, and the part that fixes each.

What it fails on, and why

Lamps & electrical37.5% of failures

Lighting is the single most common MOT failure and the cheapest to put right. A blown headlight, brake-light or number-plate bulb, a cracked lens, or a headlamp beam that points too high or low will all fail. Most are a two-minute bulb swap.

Brakes12.5% of failures

Brake failures cover worn pads and discs, an imbalance between wheels, corroded or scored discs, or a binding caliper. Braking efficiency is measured on a rolling road, so a spongy or pulling brake shows up as a low reading.

Other12.5% of failures

This covers a range of smaller items, from a non-working horn to a warning light left on.

Steering12.5% of failures

Steering faults are typically worn track-rod ends or ball joints, play in the rack, or a split gaiter letting grease out and dirt in. Excessive free play at the wheel fails.

Fuel system12.5% of failures

Fuel-system failures are leaks or an insecure filler cap.

The parts that fix each

If your car has just failed, you have 10 working days to fix the items and get a free partial retest. Confirm the exact fitment against your registration or VIN before buying.

For the lamps & electrical failure: Smc Navigator headlight and indicator bulbsShop Smc Navigator headlight and indicator bulbs on AmazonaffiliateFind Smc Navigator headlight and indicator bulbs on eBayaffiliate
For the brakes failure: Smc Navigator brake pads and discsShop Smc Navigator brake pads and discs on AmazonaffiliateFind Smc Navigator brake pads and discs on eBayaffiliate
For the steering failure: Smc Navigator steering track rod endsShop Smc Navigator steering track rod ends on AmazonaffiliateFind Smc Navigator steering track rod ends on eBayaffiliate

Other models

Smc Quadzilla MOT failures21.5% failure rateSmc Ram MOT failures22.1% failure rateSmc Cg MOT failures15.2% failure rateFord Fiesta MOT failures27.1% failure rate

Questions and answers

What is the MOT failure rate of the Smc Navigator?

It fails 14.5% of its MOT tests across the DVSA record, from 55 tests.

What do these cars fail their MOT on most?

The most common failure area is lamps & electrical, at 37.5% of this model's failures.