Peugeot 208 1.6 THP A9

The EP6CDT engine uses a single-row timing chain with a hydraulic tensioner that has a known design weakness. The tensioner contains a release valve that allows oil pressure to bleed off overnight, causing the chain to slap against its guides on cold start. This produces a distinctive rattle lasting a few seconds to half a minute. The problem typically develops between 60,000 and 100,000 km. Pre-2015 cars with the original tensioner design are most affected. PSA issued a service bulletin with revised tensioner parts (identifiable by a dot on the back) and improved white plastic chain guides replacing the earlier brown ones. If ignored, the chain can skip teeth, causing catastrophic valve-to-piston contact. Replacement of the full timing chain kit (chain, guides, tensioner, VVT sprockets) costs €900-1,300 at an independent specialist, or €1,500-1,800 at a Peugeot dealer. The issue is strongly linked to extended oil change intervals and incorrect oil specification. Cars serviced every 10,000 km or less with quality 5W-30 synthetic oil fare significantly better.

The HPFP is a well-known weak point across all Prince THP engines. It is driven off the camshaft and pressurizes fuel to the direct injection rail. Symptoms include intermittent stuttering at low RPM, difficulty starting, rough idle, and loss of power under load. Failure can be sudden or gradual. The issue typically appears between 60,000 and 120,000 km and is more common in cars driven primarily on short urban trips. PSA has released updated pump versions that are more durable than the originals. A genuine Peugeot replacement pump costs approximately €500-700 for parts, with around 1.5 hours of labor. Reconditioned units from specialists are available for €250-350. Some owners have experienced repeated failures. Short-trip driving and low-quality fuel accelerate pump wear.

Like all direct-injection petrol engines, the THP does not spray fuel over the intake valves, so carbon deposits from crankcase ventilation oil vapors accumulate unchecked. The EP6 is particularly susceptible due to its PCV system routing. Symptoms develop gradually: rough idle, misfires under load, reduced power (up to 15-20% loss), and increased fuel consumption. The problem typically becomes noticeable between 50,000 and 80,000 km. Walnut blasting is the most effective cleaning method, costing €400-600 at a specialist. Manual cleaning with the intake manifold removed is an alternative at €300-500. The issue will recur every 40,000-60,000 km regardless of driving style. Regular spirited driving at higher RPMs and avoiding excessive idling help slow the buildup, but do not prevent it.

The EP6 engine uses a plastic thermostat housing that becomes brittle from repeated heat cycling. Hairline cracks develop at the bypass pipe connection, allowing coolant to weep. The mechanical water pump can also develop shaft seal leaks from rust and contaminants circulating in the cooling system. Driver-side leaks typically indicate the water pump; passenger-side leaks point to the thermostat housing. Thermostats fitted before 2016 are known to be less durable. A thermostat housing replacement costs €250-400 at an independent garage. A water pump replacement costs €400-600 including labor. If both are done together, expect €500-800 total. The issue typically appears between 70,000 and 120,000 km. Updated replacement parts are available and more durable than the originals.

The turbo wastegate actuator can seize if the car is driven gently for extended periods, as carbon builds up on the wastegate valve and linkage. Symptoms include the EPC warning light, limp mode (reduced power), overboost fault codes, and occasionally a hissing or whistling sound. If caught early, a specialist can repair just the actuator for €400-600. However, if the turbo internals are damaged from operating with a stuck wastegate, a full turbo replacement is needed at €1,000-1,500. This issue is strongly correlated with gentle, low-RPM driving patterns. Using 98-octane fuel and regularly allowing the engine to reach full operating temperature at higher RPMs helps prevent carbon accumulation on the wastegate.

The EP6 engine has two VVT (variable valve timing) solenoids, one per camshaft, that can become contaminated with oil residue over time. Oil sludge builds up inside the solenoid screens, restricting oil flow to the cam phasers. Symptoms include rough idle, hesitation on acceleration, engine fault codes (commonly P1339, P1340), and in severe cases, a noticeable loss of power. The rear solenoid is more problematic because its retaining bolt is known to shear during removal. Contaminated solenoids can often be cleaned and reinstalled, costing just the labor (1-2 hours at €80-160). If replacement is needed, each solenoid costs €60-100. Total repair at an independent garage is €200-350. Regular oil changes with quality 5W-30 synthetic oil significantly reduce the risk. The issue is much more common in cars with extended oil change intervals.

Ignition coil failure is a documented issue across THP engines. Water ingress from blocked windscreen drains can reach the coil packs and cause premature failure. Symptoms include misfires (often felt as juddering under load), loss of power, and the engine fault warning light. A single coil pack costs €30-60. Replacing all four coils with uprated aftermarket units and new spark plugs is recommended when one fails, totaling €150-300 for parts plus around 1 hour of labor. Keeping windscreen drain channels clear and replacing worn engine cover seals helps prevent water damage to the coils.