Jeep Compass MOT failure rates: what to expect

Jeep Compass models commonly fail their MOT due to issues with tyres, brakes, suspension components, and lighting. Testers check these areas for safety and roadworthiness, focusing on tread depth, brake performance, suspension integrity, and correct operation of all lights. Owners can spot many problems early by routine visual and functional checks, helping avoid MOT failure.

Tyres: Tread Depth and Condition

Tyres are the most frequent cause of MOT failure on the Jeep Compass. The MOT tester checks that all tyres have at least 1.6mm of tread depth across the central three-quarters of the tyre and around the entire circumference. They also look for cuts, bulges, and other damage that could compromise safety.

Owners should regularly inspect their tyres for uneven wear, sidewall bulges, or embedded objects. Uneven wear can indicate alignment or suspension issues, which also affect the MOT. To check tread depth, use a tread depth gauge or the 20p coin test, inserting the coin into the tread grooves to ensure the rim is not visible.

Replacing tyres involves removing the wheel and fitting new tyres on the rim, then balancing the wheel to prevent vibrations. If uneven wear is present, a wheel alignment may be necessary to prevent premature tyre wear on the new set.

Brakes: Pads, Discs, and Performance

Brakes are a critical MOT check on the Jeep Compass. The tester examines the brake pads and discs for wear and damage, and measures braking efficiency using a roller brake tester. The minimum legal brake pad thickness is checked visually or with a gauge, while discs are inspected for scoring, cracks, or excessive thickness variation.

Owners can spot brake issues by listening for squealing or grinding noises, feeling vibration or pulling during braking, or noticing a longer stopping distance. Regular inspection of brake pads through the wheel spokes or during tyre changes helps catch wear early.

Brake repairs can involve replacing worn pads, resurfacing or replacing discs, and bleeding the brake system to remove air. Brake pad replacement requires removing the caliper, swapping the pads, and ensuring the piston is fully retracted. Disc replacement involves removing the wheel hub assembly. Brake fluid should be checked and replaced as needed to maintain braking performance.

Suspension and Steering: Wear and Damage

The MOT includes checks on the suspension and steering components for wear, damage, and excessive play. On the Jeep Compass, common failures include worn ball joints, shock absorbers leaking fluid, and damaged anti-roll bar links. The tester physically checks for movement in joints and inspects shock absorbers for leaks or damage.

Owners can detect suspension faults by noting unusual noises over bumps, excessive bouncing, or poor handling and stability. Visual inspection of shock absorbers for oil leaks and checking for uneven tyre wear can also indicate suspension problems.

Repairing suspension faults involves replacing worn components such as ball joints, bushes, or shock absorbers. The work typically requires lifting the vehicle, removing wheels, and detaching suspension arms or struts. After suspension repairs, a wheel alignment is advisable to ensure correct handling.

Lighting and Signalling: Function and Condition

Lighting faults are a common MOT failure point on the Jeep Compass. The tester checks that all lights, including headlights, indicators, brake lights, reverse lights, and number plate illumination, operate correctly and are the correct colour. They also check headlight alignment to ensure beams do not dazzle other drivers.

Owners should regularly test all lights and replace any bulbs that are dim or non-functional. Dirty or cracked light lenses should be cleaned or repaired to maintain visibility. Headlight alignment can often be checked visually by parking facing a wall and adjusting the beam height.

Replacing bulbs is straightforward, usually involving removing the light cluster or accessing the bulb holder from the engine bay or boot. More complex repairs, such as fixing wiring faults or replacing light clusters, may require professional assistance.

Exhaust and Emissions: Leaks and Noise

The MOT includes an inspection of the exhaust system for leaks, damage, and excessive noise. The Jeep Compass can fail if the exhaust has holes, rusted sections, or if the catalytic converter is faulty. The tester also measures emissions to ensure compliance with legal limits.

Owners can detect exhaust issues by listening for louder than normal engine noise, smelling exhaust fumes inside the cabin, or noticing a drop in fuel efficiency. Visual inspection under the vehicle can reveal rust or holes in the exhaust pipe or muffler.

Repairing exhaust faults involves replacing damaged sections of pipe, mufflers, or catalytic converters. This work requires lifting the vehicle and removing corroded clamps or hangers. Welding may be necessary for patching small holes, but full replacement is often more reliable.

Windscreen and Wipers: Visibility and Safety

Visibility is essential for passing the MOT, and the Jeep Compass often fails due to windscreen damage or ineffective wipers. The tester checks the windscreen for chips or cracks in the driver’s line of sight and ensures wipers and washers work correctly to clear the screen.

Owners should inspect the windscreen for any damage and replace wiper blades regularly to maintain clear vision in wet conditions. Wiper blades that streak or miss areas indicate wear and need replacement.

Replacing wiper blades is a simple task involving unclipping the old blade and fitting a new one. Windscreen repair or replacement should be done promptly if damage impairs visibility or is in the critical viewing area.

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By regularly checking tyres, brakes, suspension, lights, exhaust, and visibility equipment, Jeep Compass owners can identify common MOT failure points early. Addressing these issues before the test ensures a smoother MOT experience and safer driving on UK roads.