Mazda 626 GF
Weaknesses, engine ratings and buying advice
165 PS
626 · Benzin
V6 Gentleman
Fun to Drive!116–136 PS
2.0L 16V Benzin
7 weaknesses
Good ChoiceBody Variants
The Mazda 626 GF is available as Kombi and Sedan and Hatchback — choose your body type for specific insurance data:
Engine Overview
The Mazda 626 GF is available with 3 engine variants — from 90 to 165 hp.
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 - !! 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 - !! 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
+ 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 - ! 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 - ! 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
+ 4 more engine weaknesses + vehicle weaknesses
2.5-litre KL-DE V6 with 24 valves. Refined six-cylinder with smooth power delivery.
- !! Distributor failure from 120,000 km
The distributor with integrated electronics fails under heat — the transistor gives out. Engine cuts out after roughly 14 km of driving but can be restarted. A known V6 affliction.
Symptoms: Engine cuts out while driving, spark very weak on a warm engine, difficult cold start - !! Thermostat does not open the large cooling circuit from 110,000 km
The thermostat no longer opens the large cooling circuit — a frequently reported problem among 626 V6 owners. Upper coolant hose is hot, lower one barely warm. Engine overheats quickly.
Symptoms: Coolant temperature rises unusually fast, lower coolant hose stays cold, temperature gauge in the red - ! Valve stem seals worn from 150,000 km
At higher mileages the valve stem seals become porous. Oil passes from the cylinder head into the combustion chambers — typical when the car has been sitting and on overrun.
Symptoms: Blue smoke from the exhaust on cold start or after standing, faint oil smell, slowly dropping oil level
+ 4 more engine weaknesses + vehicle weaknesses
Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| Left Fuel Tank Rusting Through The left fuel tank on the 626 GF can corrode internally and develop leaks. Complete through-rust has been documented in isolated cases and requires a tank replacement. Symptoms: Fuel smell under the vehicle, fuel loss, visible dampness on the underside on the left from 120,000 km | Medium | |
| Rust on Wheel Arches, Door Folds and Tailgate Nearly all 626 GF show rust on the rear wheel arches (10 o'clock position on the wheel arch), door folds and tailgate. Poor factory sealing is the main cause. Symptoms: Blistering and rust on wheel arch edges, visible through-rust on lower door faces and tailgate folds from 80,000 km | Medium |
Top Reported Issues
Alternatives
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Known Problems and Issues +
A total of 29 weaknesses have been documented for the Mazda 626 GF (1997–2002) — 21 engine-related and 8 vehicle-related. Typical issues affect Rust, Brakes, Electronics, Interior. Considered reliable: FS (2.0L 16V), KL-DE (2.5L V6).
626 (RF, 1998–2002) — Be Careful: Interference Engine — Engine Damage on Timing Belt Failure, Leaking Injection Pump (Solenoid Valve), Injection Driver Module (IDM) Earth Fault. Power: 90 PS.
626 (RF, 1998–2002) — Be Careful: Interference Engine — Engine Damage on Timing Belt Failure, Leaking Injection Pump (Solenoid Valve), Injection Driver Module (IDM) Earth Fault. Power: 101 PS.
What to watch out for with the Mazda 626? See the detailed listing of all engine and vehicle weaknesses in the sections above.
Frequently Asked Questions
What problems and weaknesses does the Mazda 626 GF have? +
What should I look for when buying a used Mazda 626 GF? +
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Which Mazda 626 GF engine is the most reliable? +
Which Mazda 626 GF engine is the most fun? +
Is the Mazda 626 GF worth buying used? +
What horsepower variants are available for the Mazda 626 GF? +
Last updated: February 2026 · All information without guarantee