Vauxhall Mokka 1.4 Turbo (2012–2019): Common Faults and What to Check Before You Buy

The Mokka was the car that convinced a lot of British families they wanted a small SUV, and the 1.4 Turbo petrol was the sensible engine choice for anyone who didn’t fancy a diesel. It’s punchy enough for the school run and the motorway, reasonably refined when it’s healthy, and it sidesteps the DPF and EGR misery that city-based diesel Mokkas often run into.

The catch is that the 1.4-litre A14NET engine and the M32 six-speed manual bolted to it both have well-documented weak spots. Most Mokkas on the used market now are eight to thirteen years old, so whether you’re looking at a 2013 car with 90,000 miles or a tidy 2017 Mokka X, the same handful of checks will tell you most of what you need to know.

What you’re actually buying

The pre-facelift Mokka (2012–2016) uses the A14NET: 1.4 litres, 138bhp, 200Nm of torque, mated to a six-speed manual (the M32) or a six-speed automatic. From late 2016 the Mokka X arrived with a revised 1.4 Turbo making around 150bhp, but the manual gearbox story barely changed. Kerb weight is about 1,400kg, so it’s a heavy little thing for its size — expect low 40s mpg on a run and mid-30s around town.

That weight matters more than you’d think. It’s why clutches, front tyres and brakes work harder than you’d expect, and part of the reason the gearbox has a tough life.

The four faults that matter most

1. Turbo failure

The A14NET’s turbo is oil-fed, and it doesn’t tolerate sludged or neglected oil. Short trips, long service intervals and missed oil changes are the usual culprits. Warning signs include blue-grey smoke on start-up or under acceleration, a siren-like wail that rises and falls with boost (a faint whistle is normal, a wailing noise isn’t), a flat spot under load and limp mode. Oil weeping around the turbo feed and return pipes is a red flag, as is wastegate rattle.

A reconditioned turbo fitted typically runs £600–£1,000, and a new OEM unit with labour can push £1,100–£1,400. Crucially, find out why it failed — if the oil feed was restricted, a replacement can go the same way.

2. Coolant loss — thermostat housing and water pump

The plastic thermostat housing is a known leaker. Look for crusty pink or orange residue around the front of the engine, and check the coolant level when the engine is stone cold. Water pump failures are common too, sometimes as a noisy bearing, sometimes just a weep.

Symptoms to watch for: the coolant level dropping with no puddle underneath (it evaporates on the hot engine), the heater blowing cold at idle, and the temperature gauge creeping above normal. Budget £200–£350 fitted for a thermostat housing and £250–£450 for a water pump including coolant. Ignoring a low coolant level risks head gasket damage, which turns a cheap fix into an expensive one.

3. PCV valve failure and oil leaks

The positive crankcase ventilation valve lives in the camshaft cover. When it fails you get a rough or hunting idle, a whistling noise, rising oil consumption, and crankcase pressure that pushes oil past seals. Look for oil around the cam cover, the oil filter and cooler housing, and drips on the undertray.

Doing it properly usually means a new cam cover with the integrated valve: £300–£500 fitted. It’s still cheaper than endlessly topping up oil and replacing blown seals.

4. M32 gearbox bearing wear

This is the one that catches people out. The M32 six-speed manual is known for input shaft bearing and fifth/sixth gear bearing failures. Symptoms include a whine or rumble in fifth and sixth at motorway speed, a rumbling noise at idle that vanishes when you press the clutch, crunchy or stiff selection, and oil weeping from the end cover.

Your test drive must include a stretch of dual carriageway or motorway in fifth and sixth. A rebuild or recon unit is £700–£1,200 plus £300–£500 fitting, or around £900–£1,500 for a recon exchange fitted. Do the clutch and release bearing while the box is out — another £250–£450, but false economy to skip. The M32’s oil is often described as sealed for life; changing it every 40,000 miles is cheap insurance.

Why low mileage isn’t always good news

Plenty of Mokkas are second cars doing 3,000–5,000 miles a year of short journeys. That’s harder on a car than 12,000 miles of motorway cruising. The results are sludged oil (bad news for the turbo), corroded exhausts, flat batteries, dried-out air con seals and sticky brakes.

Ask what kind of use the car has had, and check the service history for oil changes at least every 12 months regardless of mileage. A 70,000-mile motorway car with a full book is often a better bet than a 35,000-mile town car with one stamp.

Other things worth checking

• Electrics: infotainment screen, reversing camera, heated seats, all four windows, parking sensors. Gremlins are common.
• Air conditioning: it should blow genuinely cold within a minute. Condenser corrosion is common — £200–£350 fitted, plus £50–£80 for a regas.
• Battery: short trips kill them. A replacement is £120–£200.
• Suspension: clonks over bumps usually mean front top mounts or anti-roll bar bushes.
• Tyres: uneven front wear points to alignment issues on a heavy car.
• Body: check panel gaps, overspray and mismatched paint, and make sure the locking wheel nut key is present.

Pre-purchase checklist for a Mokka 1.4 Turbo

1. Turbo: listen for siren whine, watch for blue smoke on start-up, check for oil around the feed and return pipes.
2. Coolant: check the level cold, look for crusty residue around the thermostat housing, confirm the heater blows hot.
3. Oil leaks: inspect the cam cover, oil filter housing and undertray for fresh drips.
4. Gearbox: 60–70mph in fifth and sixth, listen for whine; check for idle rumble that stops with the clutch pressed.
5. Electrical and air con: test every switch, screen and seat heater, and confirm the air con is properly cold.
6. History: annual oil changes, cambelt/auxiliary work where applicable, MOT advisories, and no gaps in the mileage record.
7. Price: early 2012–13 cars with 100,000 miles sit around £3,000–£4,500; a 2015–16 with 60–70k is £5,000–£6,500; a low-mileage 2018–19 Mokka X is £8,000–£10,000.

The takeaway

The Mokka 1.4 Turbo is a genuinely useful, comfortable small SUV with a decent driving position and a forgiving ride — and a well-maintained one is perfectly happy well past 100,000 miles. But the turbo, cooling system, PCV and M32 gearbox are all real, documented risks, and any one of them can cost you four figures.

Go in with your ears open on the test drive, insist on evidence of regular oil changes, and budget £500–£800 for the first year of sorting. If the seller won’t let you take it on a fast road or won’t discuss the service history, walk away — there are plenty of others.

When you’re ready to make the change, UpCars.uk is a good place to start looking, since the cars listed there are checked over properly before they go up — which takes a fair bit of the guesswork out of buying used.