Mazda 6 1.8 GH

The GH Mazda 6 uses an all-electric power steering rack with an integrated torque sensor and motor. The sensor can drift out of calibration over time, resulting in steering that feels light in one direction and heavy in the other. In some cases the car actively pulls to one side. Mazda dealers can attempt recalibration via the MDS diagnostic tool, but this does not always resolve the underlying sensor degradation. A permanent fix requires a replacement or reconditioned steering rack. Reconditioned exchange units from European specialists cost around €600-900 for the part, with 3-4 hours of labor on top. A new OEM rack from Mazda is considerably more expensive. The issue develops gradually, typically after 100,000-150,000 km, and is more common in cars that have done a lot of low-speed parking maneuvers.

Mazda of this era had a well-documented weakness in anti-corrosion treatment. The GH generation improved over the GG but remains susceptible, particularly in Northern and Central European countries where road salt is used. Rust typically starts from the inside on rear wheel arches and sills, making it difficult to spot until paint starts bubbling. The front subframe is also vulnerable. In North America, Mazda issued a recall for front subframe corrosion on 2009-2010 models. In Europe, no formal recall was issued but the same design applies. Minor arch and sill repairs cost €300-500 per area. Subframe replacement or welding runs €1,000-2,000. Cars from Southern European countries or those consistently garaged tend to be far less affected. Always inspect from underneath on a lift.

The L8-DE MZR engine uses hydraulic lash adjusters that can stick, producing a noticeable ticking noise on cold start lasting a few seconds to half a minute. This is primarily caused by oil that has drained from the lifters overnight. In most cases the ticking disappears as oil pressure builds and is considered a nuisance rather than a reliability threat. However, persistent ticking that continues after warm-up indicates worn adjusters that should be replaced. Using the correct oil viscosity (5W-30) and maintaining strict 12-month or 15,000 km oil change intervals significantly reduces the risk. Replacing all HLAs costs €400-800 at an independent shop including labor, though many owners live with minor cold-start tick for years without further issues.

The cooling fan control module is a known weak point across multiple Mazda 6 generations. It can fail in two ways: stuck off (fan does not run, engine overheats at idle or in traffic) or stuck on (fans run continuously even with engine off, draining the battery). Mazda issued a Special Service Program (SSP 71) for this part on earlier models. The part itself costs €50-80, and replacement is a straightforward job taking about an hour. The risk is mainly in not noticing the failure early enough. If the engine overheats significantly before the driver reacts, secondary damage to the head gasket or cooling system seals can occur. Monitoring the temperature gauge, especially in summer city driving, is important.

The Mazda 6 GH uses hydraulic (liquid-filled) engine mounts that degrade over time, typically after 80,000-120,000 km. Symptoms include increased cabin vibration at idle, a noticeable clunk when shifting into drive or reverse, and vibration felt through the steering wheel. The car has three mounts (two engine, one transmission). OEM mounts from Mazda cost €100-160 each. A full set replacement at an independent shop runs €250-600 depending on how many need replacing and whether OEM or aftermarket parts are used. Aftermarket mounts are cheaper but may not match OEM isolation quality.

The thermostat on the L8-DE engine can stick in the open position, preventing the engine from reaching optimal operating temperature. This triggers a P0128 diagnostic code and the check engine light. Symptoms include a heater that blows lukewarm air and slightly higher fuel consumption. The part costs €30-60 and labor is approximately 1.5 hours. It is a minor inconvenience rather than a serious risk, but should be addressed to avoid increased fuel consumption and accelerated engine wear from running too cold.