Mazda Premacy CP

2.0-litre common-rail diesel in various development stages (RF4F, RF5C, RF7J). Solid everyday diesel with good torque.

• !! Interference Engine — Engine Damage on Timing Belt Failure from 80,000 km

  The RF diesel is an interference engine. If the timing belt snaps, pistons and valves collide — the cylinder head must be replaced. Change interval: 80,000 km or 8 years.

  Symptoms: Engine won't start after belt snap, no compression, metallic noises on start attempts
  300–400 $
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• !! Leaking Injection Pump (Solenoid Valve) from 100,000 km

  The solenoid valve beneath the injection pump leaks. Diesel seeps out and can attack coolant hoses and wiring looms. Diesel specialists replace only the valve rather than the entire pump.

  Symptoms: Diesel smell in engine bay, visible fuel moisture beneath the injection pump, swollen coolant hoses
  150–800 $
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• !! Injection Driver Module (IDM) Earth Fault from 130,000 km

  The Denso injection driver module (IDM, RF2A-18-701A) under the intake manifold develops earthing problems with age. Fault codes are often not set — difficult to diagnose.

  Symptoms: Engine barely responds to throttle when cold, jerky acceleration below 1,500 rpm, normal behaviour above 2,500 rpm
  200–600 $
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+ 4 more engine weaknesses + vehicle weaknesses

1.8-litre four-cylinder with twin camshafts. Solid power and good refinement for the compact class.

• !! Timing Belt: Interference Engine, Replace Every 90,000 km from 90,000 km

  The FP is not a non-interference engine — a snapped timing belt risks engine damage through piston-to-valve contact. Always replace the tensioner pulleys at the same time. Full cost on the Premacy around 670–910 EUR.

  Symptoms: No warning symptom. Tensioner pulley noise can indicate wear. If belt snaps, immediate engine failure.
  400–900 $
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• !! Oil Consumption at High Mileage from 180,000 km

  The FP engine tends toward increased oil consumption at high mileage (from around 180,000 km) due to worn oil control rings or valve stem seals. Documented cases of running on 3 cylinders.

  Symptoms: Heavy oil consumption, occasional running on 3 cylinders, blue smoke, compression loss
  500–2,000 $
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• ! Intake Manifold Gasket Hardened — False Air Ingress from 120,000 km

  The intake manifold gasket hardens with age and becomes porous, causing the engine to draw in false air when cold. The fault is most pronounced during cold running and disappears once the engine is warm.

  Symptoms: Engine runs roughly when cold as if on 3 cylinders, rough cold start, symptoms disappear after 2–3 km
  50–200 $
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+ 4 more engine weaknesses + vehicle weaknesses

2.0-litre DOHC four-cylinder from the F-series. Wide deployment from compact to mid-range, maintenance-friendly and long-lived.

• !! Water Pump Seizes Timing Belt — Total Engine Failure Possible from 90,000 km

  If the water pump is not replaced during a timing belt service, it can seize and snap the belt. Documented case: rocker arm, valve, and cylinder head damage. Parts cost alone around 700 EUR.

  Symptoms: Screeching scraping followed by engine failure, no prior warning, engine can stop under full throttle
  400–2,500 $
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• ! Intake Manifold Gasket Porous and Throttle Body Fouled from 100,000 km

  The FS intake manifold gasket hardens; the throttle body is prone to carbon build-up. Both together lead to rough idle and poor cold starting. One of the most common complaints in the 626 GF/GW forum.

  Symptoms: Rough cold running, engine stalls when declutching, fluctuating idle, poor throttle response
  30–300 $
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• ! HT Leads and Spark Plugs Wear Prematurely from 60,000 km

  HT leads and spark plugs are known wear items on the FS engine. Explicitly mentioned in the 626 GF collective fault thread. Faulty leads cause misfires.

  Symptoms: Misfires, rough idle, surging under load, increased fuel consumption
  50–150 $
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+ 4 more engine weaknesses + vehicle weaknesses