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Mazda · Mid-Size · 1997–2002 Custom Search

Mazda 626 GF

Weaknesses, engine ratings and buying advice

★★★★★
3.7 / 5.0 · Based on 3 engine variants · How we rate

The Mazda 626 GF (1997–2002) is the penultimate 626 generation — saloon, hatchback and estate, comfortable and technically solid, but today a notorious rust candidate.

Engine choice: FS (2.0, 85–100 kW) — the reliable volume petrol, a robust NA unit. KL-DE (2.5 V6, 121 kW) — the smooth, refined V6 for enthusiasts. RF (2.0 DiTD) — the torquey diesel.

Weak points: heavy rust at the wheel arches (the 10-o'clock spot), door seams and tailgate — nearly every GF affected; the left fuel tank can rust through internally. Plus rear calipers seizing, ABS rear-axle sensors, control-arm ball joints, A/C condenser leaks, a faulty steering-effort sensor, peeling steering-wheel trim.

Test-drive checklist: Check the arches, tailgate and especially the fuel-tank area for rust — that decides the GF purchase. Rear calipers for seizing, the ABS light, A/C performance.

Market 2026: a 2.0 at 170,000 km runs $1,800–3,500, a clean V6 a bit more. Insider pick: the FS (2.0) manual as a robust daily — the KL-DE (2.5 V6) is the enthusiast's treat, but only a rust-free example is worth it at all.

Most Fun Engine

165 PS

626 · Benzin

V6 Gentleman

Fun to Drive!
Most Reliable Engine

116–136 PS

2.0L 16V Benzin

7 weaknesses

Good Choice
Problem Engine

90–143 PS

2.0L DiTD Diesel

6 weaknesses

Stay Away!

Body 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.

2.0L DiTD · Diesel· 90–101 PS
1998 2002

The 2.0 DiTD is an older pre-chamber/common-rail diesel with a distributor injection pump — robust in principle but with clear weak points. Importantly, it is an interference engine; a snapped timing belt risks bent valves and broken rocker arms. A common trigger is the belt-driven water pump seizing and taking the belt with it — so always replace the water pump with the belt. The distributor injection pump and high-pressure lines can leak, as can the injector flame shields. EGR carbon is common. With the belt/pump interval kept and the injection system maintained, it is a long-lived diesel.

  • !! 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 $
    Ad Timing belt kit RF diesel Mazda 626Timing belt Mazda Premacy 2.0 diesel
  • !! Water pump seizes — timing-belt failure from 120,000 km

    The belt-driven water pump can seize and take the timing belt with it. As the RF is an interference engine, bent valves and broken rocker arms follow — major damage. Always replace the water pump with the timing belt.

    Symptoms: Coolant loss/overheating, then sudden belt failure with engine damage.
    1,500–3,000 $
    Ad Mazda 2.0 DiTD RF water pumpMazda RF diesel timing belt kit
  • !! 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 $
    Ad Solenoid valve injection pump RF Mazda PremacyMetering valve RF2A diesel pump

+ 3 more engine weaknesses + vehicle weaknesses

2.0L 16V · Petrol· 116–136 PS
1997 2002

The 2.0 16V (FS) is the larger belt-driven naturally aspirated petrol of the late 1990s and 2000s — solid and long-lived. It is a non-interference engine: a thrown belt usually does not damage it. The real risk is the belt-driven water pump, which can seize suddenly and take the belt with it (sometimes shortly after a belt change) — so always renew the water pump and tensioner with the belt. The most common daily nuisance is the vacuum-leak complex: a porous intake-manifold gasket, a worn idle control valve and throttle fouling cause a rough idle. Ignition leads, valve-cover gasket and engine mounts are usual wear points.

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

    The FS is a non-interference engine — a thrown belt usually leaves the engine undamaged. But the belt-driven water pump can seize suddenly (sometimes shortly after a belt change) and take the belt with it: the engine stops, with an overheating risk. So always renew the water pump and tensioner with the belt.

    Symptoms: Screeching scraping followed by engine failure, no prior warning, engine can stop under full throttle
    400–2,500 $
    Ad water pump FS Mazda 626timing belt kit FS 2.0 626 GF
  • ! 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 $
    Ad intake manifold gasket FS Mazda 626throttle body gasket 626 GF 2.0
  • ! 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 $
    Ad Zündkabel FS Mazda 626 2.0Zündkabelkit 626 GF FS

+ 4 more engine weaknesses + vehicle weaknesses

2.5L V6 · Petrol· 165 PS
1997 2002

The 2.5 V6 (KL-DE) in the 626 is a smooth, fundamentally solid naturally aspirated engine — the GF generation uses modern coil-pack ignition rather than a distributor. Typical topics are age-related: failing ignition coils with misfires, a weeping valve-cover gasket (oil in the spark-plug wells), a sticking thermostat and a hardened intake-manifold gasket causing a vacuum leak and rough idle. A lazy lambda sensor and worn engine mounts round it off. With regular service a long-lived, uncomplicated V6.

  • !! Ignition coil / coil-pack failure from 120,000 km

    The GF generation of the 2.5 V6 uses coil-pack ignition (EDIS), not a distributor. The coils fail over time and cause misfires and rough running. Replacement is straightforward.

    Symptoms: Stumble, check-engine light, rough running, cylinder-specific misfire.
    120–200 $
    Ad Mazda 626 2.5 V6 ignition coilMazda KL-DE coil pack
  • ! 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
    300–700 $
    Ad valve stem sealen KL-DE Mazda 626 V6Dichtkit 2.5 V6 Mazda GF
  • ! 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
    80–200 $
    Ad thermostat Mazda 626 V6 KL-DEthermostat housing 2.5 Mazda GF

+ 4 more engine weaknesses + vehicle weaknesses

Vehicle Weaknesses

WeaknessCost
✖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
Ad fuel tank Mazda 626 GFTank 626 GF left
 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
Ad wheel arch Mazda 626 GF repair panelrocker panel 626 GF
 Medium
NHTSA Owner Complaints
Below average
1,641 complaints · 1997–2002
  1. 01 Powertrain
    1,157 ⚠ 8
  2. 02 Engine & Cooling
    212 ⚠ 2
  3. 03 Airbags
    77 ⚠ 39
  4. 04 Electrical
    73 ⚠ 2
  5. 05 Equipment
    69 ⚠ 2

Top Reported Issues

⚠ Powertrain (1157 complaints)
⚠ Engine & Cooling (212 complaints)
⚠ Airbags (77 complaints)
Source: NHTSA (nhtsa.gov) · 2026-03

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Known Problems and Issues +

A total of 28 weaknesses have been documented for the Mazda 626 GF (1997–2002) — 20 engine-related and 8 vehicle-related. One problem engine: RF (2.0L DiTD). Typical issues affect Rust, Brakes, Electronics, Interior. Considered reliable: FS (2.0L 16V), KL-DE (2.5L V6).

626 (RF, 1998–2002) — Stay Away!: Interference Engine — Engine Damage on Timing Belt Failure, Water pump seizes — timing-belt failure, Leaking Injection Pump (Solenoid Valve). Power: 90 PS.

626 (RF, 1998–2002) — Stay Away!: Interference Engine — Engine Damage on Timing Belt Failure, Water pump seizes — timing-belt failure, Leaking Injection Pump (Solenoid Valve). 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? +
The Mazda 626 GF has 20 known engine weaknesses and 8 vehicle weaknesses.
What should I look for when buying a used Mazda 626 GF? +
faq.watch_a_avoid faq.watch_a_rec
Which engine is recommended? +
Good choice: FS (2.0L 16V), KL-DE (2.5L V6). The most reliable engine is the FS (2.0L 16V) with the lowest risk score. The most fun to drive is the KL-DE (2.5L V6). Problem engine: RF (2.0L DiTD) — stay away!
Which Mazda 626 GF engine is the most reliable? +
The {code} ({displacement}) is the most reliable engine in the Mazda 626 GF. It has the lowest risk score of all available engines and is rated "Good Choice". However, there are 7 known weaknesses to be aware of.
Which Mazda 626 GF engine is the most fun? +
The {code} ({displacement}) offers the most driving fun in the Mazda 626 GF — rated: "Fun to Drive!". {description} The silky V6 with manual gearbox turns the 626 into an underrated gentleman's express. Balanced and assured.
Is the Mazda 626 GF worth buying used? +
The Mazda 626 GF is a good choice as a used car — 2 of 3 engine variants are rated 'Good Choice'.
What horsepower variants are available for the Mazda 626 GF? +
The Mazda 626 GF is available with engine variants from 90 to 165 hp. Petrol: FS (2.0L 16V), KL-DE (2.5L V6). Diesel: RF (2.0L DiTD).

Last updated: February 2026 · All information without guarantee