Nissan Micra 1.2 K12

The K12 Micra uses a TRW electric power steering system integrated into the steering column. The internal control board components or motor brushes can burn out, typically between 80,000 and 150,000 km. Failure often starts intermittently before becoming permanent. Symptoms include the power steering warning light illuminating and a sudden increase in steering effort. The car remains driveable but steering becomes very heavy at parking speeds. Nissan dealers charge around €1,000-1,200 for a complete column replacement. The column contains an anti-theft chip (NATS) linked to the VIN, which means second-hand units need reprogramming to work. Specialist repair companies offer reconditioning of the existing unit for €300-450, replacing the internal relays and motor brushes. This is one of the most frequently discussed K12 faults across owner forums and affects all engine variants equally.

Early K12 models (particularly 2003-2004 production) used a weaker timing chain that could stretch prematurely, sometimes below 80,000 km. The CR12DE shares the same chain system as the CR10DE and CR14DE in the K12 family. A stretched chain causes the camshaft and crankshaft sensor signals to fall out of phase, triggering a P0340 camshaft position fault code and putting the engine into limp mode. Symptoms include rough idle, loss of power, and cold-start rattling. Nissan revised the chain components from 2004-2005 onwards, making this primarily a concern for early production cars. The tensioner protrusion can be checked by removing the rocker cover: anything over 10 mm indicates a stretched chain. Parts (chain, guides, tensioner, sprockets) cost approximately €100-200, with labour running 5-6 hours. Regular oil changes with quality 5W-30 synthetic oil help prevent premature wear.

The K12 uses an electronic throttle body that develops internal electrical faults over time. Unlike many throttle body problems, cleaning the unit with carburettor cleaner does not resolve the issue because the fault lies in the electronics, not carbon buildup. Symptoms include erratic idle speed, hunting revs, stalling at traffic lights, and the engine refusing to rev above 2,000 rpm (typical fault codes P1126 and P1122). Nissan does not sell individual throttle body components, requiring a complete unit replacement. A new OEM unit costs approximately €300-500 fitted. Specialist remanufacturers offer rebuilt units for €200-280. After replacement, the throttle body must undergo an idle relearn procedure: disconnect the battery for 15 minutes, then allow the engine to idle for several minutes without touching the throttle. This issue affects all K12 petrol engines.

The boot latch microswitch on the K12 is prone to water ingress and corrosion, particularly in wet climates. When the switch shorts out, it can cause the boot to pop open on its own while driving, refuse to open at all, or create a parasitic battery drain that flattens the battery overnight. This is one of the most common K12 complaints and is well documented on owner forums. The switch costs €30-60 and replacement takes under an hour. The wiring loom running through the tailgate hinge area can also fatigue and break from repeated opening and closing. If both switch and wiring need repair, costs rise to €100-200. In some cases the short circuit causes cascading electrical issues including immobiliser faults when the battery goes flat.

Broken front coil springs are a well-documented issue on K12 Micras. The springs corrode from the inside out and eventually snap, typically at the bottom coil where they sit in the spring seat. This results in a sudden clunking noise and visible lean to one side. It is classified as a major defect and a common reason for MOT/TUV failure on older K12s. Both coil springs should be replaced at the same time even if only one has broken. The upper spring mounts can also corrode, particularly on cars from salt-road regions. Parts cost approximately €40-80 per pair, with labour around €100-200 per axle. Cars driven in northern Europe with road salt are most susceptible.

The CR12DE uses individual coil-on-plug ignition, and coil failures are a common cause of misfires on higher-mileage K12s. Some owners report repeated coil failures, potentially linked to E10 ethanol fuel sensitivity. Oil leaks from the valve cover gasket can seep into the spark plug tubes, damaging the coil boots and accelerating failure. The wiring loom running across the top of the cylinder head can also chafe against the rocker cover, causing intermittent misfires that persist even after coil replacement. Replacing all four coils and spark plugs costs €80-150 using aftermarket parts, or €150-250 with OEM components. If the wiring harness is damaged, specialist repair adds €100-150.

The front suspension lower wishbone bushes are a known wear point on the K12, frequently flagged by TUV/MOT inspectors. They typically need replacement between 60,000 and 100,000 km, with cars driven on rough roads wearing faster. Symptoms include clunking or knocking when driving over bumps and uneven tyre wear. Anti-roll bar drop links also fail regularly, adding to the noise. Parts are very cheap (wishbone arms approximately €25-40 per side, drop links €10-20 per side), making this an inexpensive repair despite being common. Both sides should be replaced at the same time.