2004 Nissan 350Z Problems: 13 Known Issues

On the 2003-2004 Nissan 350Z VQ35DE, the rubber fuel filler hose between the filler neck and the tank can crack, letting fuel leak while the car is being refueled. With an ignition source nearby this is a fire risk. Nissan recalled 2003-2004 350Z under NHTSA campaign 05V555000 as part of a large multi-model action covering roughly 192,000 vehicles, with owner notification starting February 27, 2006 for Nissan owners. Because this is a rubber component on a twenty-year-old car, unrepaired examples and cars whose hoses were never inspected still turn up with fuel smell at the rear.

On the 2003-2006 Nissan 350Z VQ35DE, the fuel pressure dampers sit on the fuel rails to smooth injector pulsations. The internal diaphragm fails, first producing a distinct ticking or light knocking noise from the top of the engine at idle that owners routinely mistake for injector or valvetrain noise, and then allowing raw fuel to seep from the damper — classically a steady drip while the engine is cold that stops as it warms. Nissan issued a technical service bulletin covering the ticking-noise complaint on 2003-2006 cars. There is no recall for the damper itself, and a fuel leak on top of a hot V6 is a genuine fire risk rather than a cosmetic annoyance.

On the 2003-2009 Nissan 350Z, the immobilizer checks the registered ignition key before permitting a start. A NATS lock-mode code and a key-read code describe different stages of that check, not a confirmed failed part. Interference, key identification and antenna-circuit faults need to be distinguished. A mechanical key-turning problem is a separate branch.

On the 2003-2009 Nissan 350Z, the 350Z's power window regulators fail frequently, with the window falling into the door or moving slowly/erratically. The window motor wears out and the regulator cable frays or the gear mechanism strips. The frameless door design means a failed window cannot seal properly, allowing rain intrusion. Driver's side fails more frequently due to higher usage.

On the 2003-2009 Nissan 350Z, the factory xenon headlamps on HID-equipped Z33s often fail at the ballast or the igniter, not just the bulb. The ballast steps 12V up to the striking voltage and the igniter supplies the initial arc; as either degrades the lamp flickers, buzzes, dims, shifts colour toward pink or purple, cuts out at random, or fails to strike at all — often one side first. Dealers commonly quote a complete headlamp assembly at $900-$1,000, which is why owners on the forums consistently point out that replacing the ballast or igniter alone is the correct repair. Applies across the HID-equipped run of both engine generations.

On the 2003-2006 Nissan 350Z VQ35DE, the VQ35DE runs close-coupled pre-catalysts in the exhaust manifolds. When the ceramic substrate breaks down — accelerated by an engine already consuming oil, by misfires, or by heat — the fine abrasive debris can be drawn back into a cylinder during valve overlap and at high rpm, where it scores the bore and wrecks the rings. The result is not a converter repair but a rebuilt or replaced engine, and it is the single most consequential thing to check before buying an early Z. It compounds the known VQ35DE oil-consumption problem: burning oil poisons the cats, and dying cats then kill the engine. Owner reports cluster well into six figures of mileage. The 2007-2009 VQ35HR uses a different exhaust manifold/catalyst arrangement and does not carry this reputation.

On the 2003-2006 Nissan 350Z VQ35DE, circuit boards inside the crank position sensor and cam position sensors were built with improper solder joints; heat stress accelerated by flux residue cracks the joint, so the sensor drops out intermittently as it warms up. The engine stalls without warning while driving, or refuses to restart until it cools. Nissan recalled the affected sensors under NHTSA campaign 03V455000, covering 2003 350Z among a very large group of VQ-powered Nissan and Infiniti vehicles built in the affected sensor window, with owner notification beginning December 22, 2003. Beyond the recall population, crank sensor failure remains one of the most common causes of hot-stall on 2003-2006 VQ35DE cars in general — a recall-repaired car can still fail again years later on an aftermarket sensor.

On the 2003-2004 Nissan 350Z VQ35DE, early Z33s chew through front tires with a sawtooth 'feathered' wear pattern that produces a loud tire roar, often destroying a set of tires in well under 15,000 miles. The car is extremely sensitive to alignment settings, and under braking and cornering the multi-link geometry moves far enough from the static alignment that the leading edge of each tread block scrubs. Nissan initially blamed dealer-set toe and issued a long TSB (reported by owners as NTB04-043) covering alignment specs and tire-related remedies, extended 2003 front alignment warranties, and ultimately settled a class action offering tire credits and dealer shopping cards to 2003 and 2004 owners. The suspension revisions made during the run did not change the underlying geometry. Approximately 40,000 2003 cars were affected.

On the 2003-2009 Nissan 350Z, the front compression rod, which controls fore-aft location of the front hub, is located by a soft rubber bushing designed around stock ride height. It tears — universally on lowered cars, because the rod no longer sits level and the bushing is stretched at rest, and eventually on stock cars with age. A torn bushing produces a clunk over bumps and under braking, lets caster wander so the alignment will not hold, and directly contributes to the Z's reputation for uneven front tire wear. It is separate from the lower control arm ball joint, which produces a similar noise and should be checked in the same inspection.

On the 2003-2009 Nissan 350Z, z33 rear quarter panels and wheel arch lips corrode from behind, so the first sign is paint blistering or bubbling along the arch lip, at the seam where the quarter meets the rear bumper, and around the antenna base. Owners report it on low-mileage cars — including a 2003 with around 50,000 miles — because it is driven by moisture and road salt trapped behind the arch liner rather than by mileage. Rolled or pulled arches, common on modified cars, crack the paint at the lip and accelerate it dramatically. Because the corrosion starts on the inner face, sanding and respraying the outside alone always brings it back.

On the 2004-2009 Nissan 350Z, the 2004-2009 350Z Roadster power top is not a hydraulic system; it is a network of five separate electric motors plus limit switches and sensors that must all report correctly before the top will cycle. The 5th bow motor is the recognised weak point — it uses the same brush design that fails in the car's window motors, so it stalls partway and the whole sequence aborts, leaving the top stuck half open. Owners are frequently sold a whole new top mechanism when the actual fault is one motor, a stretched top strap, or a brake light switch that stops the control logic from allowing operation.

On the 2003-2009 Nissan 350Z, the Z33 rear differential is located by fluid-filled (silicone) rubber mount bushings. Those bushings tear — quickly on cars driven hard, tracked or making more than stock power, and eventually on all of them with age — letting the differential move fore and aft under torque. The result is a hard clunk on throttle on/off transitions, a shudder pulling away, and a general slop through the driveline that also loads the halfshafts, driveshaft and its centre support. Owners often misdiagnose it as a failing differential or a bad U-joint. Applies across the whole 2003-2009 run and to both engines.

On the 2003-2004 Nissan 350Z VQ35DE, the 2003 and early 2004 six-speed manual is known among owners for weak 3rd and 5th gear synchros. The box grinds or crunches on the shift into those gears, worst when the transmission is cold and easing somewhat as the fluid warms — the opposite of a simple fluid problem, and it gets steadily worse with mileage. Nissan revised the gearbox during the run; the later CD009 unit fitted to the higher-output and 2007+ cars is regarded by the community as the durable version and is the standard swap. This is a transmission-build issue tied to the early cars, not a VQ35HR-era complaint.