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What P0301 means for your Toyota RAV4
Cylinder 1 misfire on the RAV4 is almost always one of three things: an aging ignition coil, a worn iridium spark plug, or - on older 2.4L 2AZ-FE engines - oil-fouled plugs from the well-known oil consumption problem. The 2.5L 2AR-FE in 2013-2018 RAV4s shares Camry coil packs and suffers the same 80k-130k mile coil failures. The newer A25A-FKS (2019+) is too young to have major data yet, but coils still age the same way.
🎯 Top Causes on the Toyota RAV4
60%
#1 CAUSE
Cylinder 1 Coil Pack
Same coil packs as the Camry, same 80k-130k mile failure window. Front-of-engine cylinder 1 coil sees the most heat. Denso/NGK OEM-equivalent coils are around $50-$80 each. Swap-test before you replace.
OEM Coil
$80-$120
Aftermarket
$45-$70
w/Labor
$110-$260
25%
#2 CAUSE
Worn or Oil-Fouled Plug
Iridium plugs at 100k miles, but oil-burning 2AZ-FE engines (2007-2009 RAV4) eat plugs much faster - check oil consumption history. Use Denso or NGK iridium spec'd for your engine. Replace all 4 (or 6 V6) at once.
Plugs (4)
$32-$60
V6 (6)
$50-$95
w/Labor
$80-$200
15%
#3 CAUSE
Oil Consumption (2AZ-FE)
The 2007-2009 RAV4 with the 2.4L 2AZ-FE has Toyota's known oil-burning issue (rings stick or wear early). Excessive oil consumption fouls plugs and causes recurring P0301. Toyota covered some under warranty extension. If you're using a quart per 1,000 miles, you have this problem - a piston ring/ring-cleaning service may help, full piston replacement otherwise.
Ring Decarb
$300-$600
Ring Replace
$1,800-$3,500
Warranty Check
Free
🚗 Most Affected RAV4 Model Years
| Year | Engine | Primary Cause | Typical Mileage | Notes |
|---|---|---|---|---|
| 2013-2018 | 2.5L 2AR-FE | Coil pack | 80k-130k | Same as Camry pattern |
| 2007-2012 | 2.4L 2AZ-FE | Coil + oil-fouled plug | 90k-160k | Oil consumption common |
| 2019+ | 2.5L A25A-FKS | Coil pack | 50k-90k | Newer engine, fewer reports |
🔧 How to Diagnose P0301 on a Toyota RAV4
- Swap-test the cylinder 1 coil. 5 minutes, confirms the most likely cause.
- Check oil level and consumption history. A 2007-2012 RAV4 burning oil shouldn't be a surprise - this affects plug life dramatically.
- Inspect plug condition. Black/sooty = rich or coil; oil-wet = oil consumption; white = lean. Replace as a set of 4.
Want a step-by-step walkthrough specific to your Toyota RAV4? Run a $5.99 AI diagnosis report - we narrow the cause to your year, engine, and symptoms.