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Mazda RX-8 Engine Problems

351 TrueDelta members own (or used to own) a 2000 or newer Mazda RX-8. 80 of these members (22.8%) have reported engine repairs for their car. A total of 156 engine repairs to Mazda RX-8s--an average of 0.4 per vehicle--have been reported.

See our lemon odds and nada odds page to see vehicles with no repairs or vehicles with more than three repairs. To see how frequently Mazda RX-8 problems occur, check out our car reliability stats.

Chart based on 318 repairs.

Mazda RX-8 engine repair cost distribution

Chart based on 56 repair trips. The repair cost chart excludes repairs made under warranty, do-it-yourself repairs, and repair trips that include maintenance.
Non-members can see only ten Mazda RX-8 repair histories. Log in or join us to see them all.

2005 Mazda RX-8 4dr Coupe

238-horsepower 1.3L R2 6-speed manual RWD

20000 mi   Engine making a rattling sound when accelerating. Commonly known on the RX8 forums as "marbles in a can". Not diagnosed by dealership (unable to reproduce), however I've read this is detonation or knock. Noise is obvious, but dealer couldn't hear. 
43000   Water pump leak...replaced under warranty. 
58000 US $120 Sputtering at low RPM & rough idle. Ignition coils required replacement (coils are "weak" in this vehicle and fail prematurely). Coils purchased and replaced. Also replaced plugs & wires. Total cost for all parts roughly $350. 
68700   Corroded oil cooler line cracked and developed massive oil leak. 

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2005 Mazda RX-8 4-door

2-cylinder manual 2WD

26660 mi   Replaced coils. 

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2004 Mazda RX-8 4dr Coupe

238-horsepower 1.3L R2 6-speed manual RWD

33000 mi US $125 Malfunctioning ignition coils. dealer said 'it wasn't a problem'. Malfunctioning ignition coils. dealer said 'it wasn't a problem'. replaced coils myself, issues went away. 
38150   CELs - Replaced intake manifold that was cracked; replaced fuel tank cap; All under warranty 
69000 US $45 PCM Computer reflash/update. 
81000   Heat shield fell out of exhaust system. It took out an Oxygen sensor when it did that. Needed a new 02 sensor. 
97700   Replaced broken motor mount 
35000   Both O2 sensors failed within 1 week of each other. Replaced under warranty 

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2004 Mazda RX-8 4dr Coupe

197-horsepower 1.3L R2 4-speed shiftable automatic RWD

34000 mi US $300 Poor engine response, especially at low rpm, followed by check engine light after a week or so. 
35000   There were 2 bulletins for weak engine, reflash and diagnostics. The diagnostics turned up shorted coil (so, driving with 1 rotor). Coil replaced on out of warranty assistance, labor paid by owner. 
46000   Fuel cap seal weak; engine light on, but car worked. After few days, car didn't start. Diagnostic showed P2070 and P0456. Replaced 2 intake manifold tuning valves. Replaced fuel cap on extended warranty. 
53000   Weak and slight knocking at mid revs under load. Stuck valve on secondary air intake freed up, engine decarbonized with Mazda kit, slightly corroded ignition wires replaced, coils replaced, air filter replaced. 

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2004 Mazda RX-8 4-door

2-cylinder automatic 2WD

38440 mi C $350 Flooded engine in cold weather. 

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