P0304 on Toyota

Early 2013-2014 Toyota 86 models were subject to a valve spring recall similar to the later GR86 issue. Improperly manufactured valve springs could fracture, causing engine misfires and potential internal engine damage. The FA20 engine's boxer layout means a broken valve spring piece can fall into the cylinder and cause catastrophic piston damage.

Certain 2017-2020 Toyota 86 vehicles equipped with the FA20 (4U-GSE) boxer engine are subject to a valve spring recall. The valve springs may have been manufactured with an improper surface treatment, making them susceptible to fracture. A broken valve spring can cause engine misfires, rough running, and in severe cases, contact between the valve and piston causing catastrophic engine damage. Toyota recall campaign E0G (NHTSA 17V-587) covers free valve spring replacement at dealers.

The water pump on the 3.5L 2GR-FE fails prematurely between 80,000-120,000 miles, developing a coolant leak from the weep hole or gasket surface. If not addressed, complete pump failure causes overheating and potential head gasket damage.

2003-2008 Corollas with the 1ZZ-FE commonly develop a vacuum leak at the intake manifold gasket, especially in cold weather. The original gasket can shrink or harden, causing rough idle, stumbling after startup, and lean-condition fault codes until the engine warms up. This issue is well known in Toyota service literature and owner communities.

The 1ZZ-FE engine used in many 2000-2008 Corollas is widely known for developing excessive oil consumption as piston oil-control rings stick or wear. Owners report needing to add oil between changes, blue smoke on startup or acceleration, fouled plugs, and eventual catalyst damage if the oil-burning is ignored. Toyota issued service information and owner complaints are abundant across NHTSA and enthusiast forums.

The individual coil-on-plug ignition coils fail from age and heat cycling on high-mileage Corollas, causing a cylinder misfire. This sets P0351-P0354 (coil circuit) and/or P0300-P0304 (misfire). OEM coil PN 90919-02239 is the common part for 2000-2008 1ZZ-FE cars. A failing coil produces rough idle, a flashing check engine light under load, and a raw-fuel smell; a chronic misfire can also foul the catalytic converter.

The 1.5L 1NZ-FE engine in the Echo develops oil leaks at the valve cover gasket and the oil filler cap seal. The rubber valve cover gasket hardens with age and heat cycling, allowing oil to seep down the side of the engine onto the exhaust manifold, producing a burning oil smell. The spark plug tube seals (integral to the valve cover gasket) also leak, allowing oil to pool around the spark plugs and cause misfires. The oil filler cap O-ring also dries out and leaks.

The 1.6L G16E-GTS turbocharged 3-cylinder engine can develop head gasket seepage under sustained high-boost driving, particularly on track or with aggressive tuning. The high specific output (300hp from 1.6L) stresses the head gasket, especially when combined with heat soak.

Toyota/Subaru recalled early 2022-2023 GR86 and BRZ models for improperly manufactured valve springs in the FA24 engine. Defective springs can fracture, causing engine misfires, rough running, and potential engine stalling while driving. Recall 22V-879.

The 2001-2007 Highlander with the 2.4L 2AZ-FE 4-cylinder engine suffers from a design flaw where the aluminum head bolt threads strip out of the engine block. The plastic intake manifold traps heat against the block, causing thermal fatigue of the aluminum threads. This leads to head gasket failure, coolant leaks, and overheating. In severe cases, the stripped threads make a simple head gasket replacement impossible, requiring thread repair inserts (Time-Serts) or complete engine replacement. This is a known issue across Toyota vehicles using the 2AZ-FE engine.

The 2TZ's distributor-based ignition is a common source of rough running as the van ages. Spark plug wires crack and corrode, and the cap and rotor burn/wear, causing misfires and rough idle. A distinctive Previa failure is oil weeping past the internal distributor oil seal, which contaminates the cap/rotor and worsens misfires; a reseal kit is available. Persistent multi-cylinder weak spark can also point to the igniter/ignition control module and harness.

Gen 3 and Gen 4 Prius models develop heavy carbon buildup in the EGR valve and intake manifold, causing rough idle, misfires, and reduced performance. The Atkinson-cycle engine's low combustion temperatures promote carbon accumulation in the EGR system.

The 1.5L 1NZ-FXE engine can develop head gasket failure allowing coolant and oil mixing, often linked to EGR cooler problems that cause localized hot spots. Typically appears after 150,000+ miles. External coolant leaks may also occur at the head gasket mating surface.

The first model years of the 4.0L 1GR-FE V6 used an early head gasket design whose sealing material between the cylinder and the coolant jacket degrades over time, allowing a small coolant leak into a cylinder. The classic signature is a cold-start misfire on cylinder 4 (and sometimes cylinder 6) that 'steam-cleans' the spark plug, throwing P0304/P0306, together with slow coolant loss from the reservoir (owners report topping off every few weeks) and a gurgling sound from the heater core on startup. Because the leak is small early on, it is frequently misdiagnosed as a bad coil or plug before the head gasket is identified. Left unaddressed it progresses to overheating and possible head/block damage.