P0300 on a Toyota RAV4
P0300 means random/Multiple Cylinder Misfire Detected. On the RAV4, a few causes come up far more than others.
What P0300 usually means on a RAV4
P0300 on a RAV4 is a random or multi-cylinder misfire the ECU can't tie to one cylinder. On older models the usual causes are worn plugs and aging coils. On the 2019-and-up A25A-FKS RAV4, there's an added angle: the low-pressure fuel pump was recalled for failing and causing stumbling, stalling, and multi-cylinder misfires, so a P0300 on those years deserves a fuel-pressure check. Expect a rough idle, a stumble under load, and a flashing light in the worst cases.
Most common causes on the RAV4
- Worn spark plugs
Overdue iridium plugs are the cheapest and most common misfire cause on any RAV4.
- Aging ignition coils
Denso coil-on-plug units weaken with age and can misfire across cylinders.
- Failing fuel pump (2019+ A25A)
The recalled low-pressure pump on newer RAV4s can starve the engine and trigger P0300 with stalling.
- Vacuum or PCV leak
A cracked hose leans all cylinders and reads as random misfire.
- 2AZ-FE oil fouling
Oil consumption on the early four can foul plugs and cause intermittent misfires.
What P0300 costs to fix on a RAV4
On older RAV4s, plugs and coils are moderate and easy to reach on the four-cylinder, while the V6's rear bank adds labor under the intake. On a 2019-plus RAV4, first confirm whether the fuel-pump recall applies — that repair may be covered by Toyota rather than out of pocket. Diagnose before swapping parts.
Fixing it
Check for open recalls by VIN on any 2019-2020 RAV4 with P0300 and stalling before buying parts, since the low-pressure fuel pump may be replaced free. On older models, start with plugs and coils and move a suspect coil to another cylinder to see if the miss follows.
For the full step-by-step diagnosis order (any vehicle), see the main P0300 guide.
Year, engine and mileage change the answer. Start a case and Redline weighs these causes against what your car shows, then names the check that would settle it.
Other codes on the Toyota RAV4
Related symptoms
Toyota RAV4 problems & recalls by year
Based on widely reported patterns for this model; individual causes vary by year, engine and history. Generic P0300 behavior is covered on the main P0300 page. Confirm with a scan tool before buying parts.
P0300 on your RAV4?
Every problem becomes a Case. Tell Redline what your RAV4 is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
“Inner pad ~1 mm. Outer pad 3 mm.”
Next: check the slide pins move freely before buying parts.