P0351 on Toyota: How to Diagnose & Fix
Ignition Coil A Primary/Secondary Circuit Malfunction
2 Toyota models · 2 documented issues · $60-$350 repair
P0351 on Toyota by model: symptoms, diagnosis and fix
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.
Common Symptoms
- Rough idle and shaking
- Flashing check engine light under acceleration
- Loss of power / hesitation
- Raw fuel smell from exhaust
How to Fix
Identify the misfiring cylinder from the codes and swap that coil to a neighboring cylinder to confirm the fault follows the coil. Replace the failed coil (and inspect/replace worn spark plugs as a set on high-mileage cars). OEM 1ZZ-FE coil PN 90919-02239 (~$40-70 each); Denso 673-1303 and other quality aftermarket units cross-reference. Use OEM/Denso-grade coils, as cheap coils commonly re-fail. Clear codes after repair.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Toyota 90919-02262 genuine direct ignition coil
single confirmed failed 1ZZ-FE ignition coil Fitment/availability: 1999-2008 Toyota Corolla 1ZZ-FE/selected catalog branch; use here for the issue's 2000-2008 1ZZ-FE and confirm VIN; supersedes 90919-02239 Fitment/availability: Ships in …
- Toyota 90080-91184 genuine spark plug
condition- or schedule-based 1ZZ-FE plug set accompanying confirmed ignition diagnosis Fitment/availability: 1999-2008 Toyota Corolla catalog branch including 1ZZ-FE; quantity four when plugs are due, worn, fouled or damaged; confirm VIN…
- Toyota 90919-02258 genuine ignition-coil assembly
single confirmed failed 2ZR-FE ignition coil Fitment/availability: 2009-2019 Toyota Corolla catalog branch including 2ZR-FE; use here for 2009-2010 2ZR-FE and confirm VIN; replaces 90919-02252 Fitment/availability: Ships in 1-3 business …
- Toyota 90919-01253 genuine spark plug
condition- or schedule-based 2ZR-FE plug set accompanying confirmed ignition diagnosis Fitment/availability: 2009-2016 Toyota Corolla catalog branch including 2ZR-FE; use here for 2009-2010 2ZR-FE, quantity four, and confirm VIN/under-ho…
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Sources for this issue (2)
The 1NZ-FE/2NZ-FE coil-on-plug packs are a recurring failure point, and cylinder 1 - the one closest to the front of the engine and nearest the cowl drain area - fails disproportionately. Two mechanisms show up on the forums: the coil's internal windings break down with heat and age, and water gets down the plug tube (from a leaking valve cover gasket, a clogged cowl drain, or an engine bay wash) and sits on the coil boot, shorting the spark to ground. Owners describe replacing the plug and coil, getting a clean year, then having it recur if the water path was never fixed. A dying coil that is left alone dumps raw fuel into the catalyst and can eventually kill the converter.
Common Symptoms
- Flashing or steady check engine light
- Rough idle and shaking at a stop
- Loss of power and hesitation under acceleration
- Misfire worse in rain or after a car wash
- Raw fuel smell from the exhaust
How to Fix
Swap the suspect coil to another cylinder - if the misfire code follows the coil, the coil is bad. Replace with an OEM Denso coil rather than a cheap aftermarket unit. Critically, fix the water source at the same time: pull the coils, dry the plug wells, replace the valve cover gasket and spark plug tube seals if oil or water is pooling, clear the cowl drains, and re-grease the boots with proper dielectric grease. Replace all four Denso iridium plugs at the same time if they are past interval.
Sources for this issue (3)
P0351 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0351 mean on a Toyota?
P0351 stands for "Ignition Coil A Primary/Secondary Circuit Malfunction." P0351 indicates the engine computer found a fault in the primary or secondary circuit of ignition coil 'A' (typically the coil for cylinder 1 or the first coil in the firing system). The PCM monitors the coil's control circuit, and when the electrical feedback doesn't match what it expects during firing, it sets this code. Because the coil creates the high-voltage spark, this often causes a misfire, rough idle, hesitation, or loss of power. It is a circuit/component fault for one specific coil rather than a general engine problem. On Toyota it is documented across 2 models: Corolla, Yaris.
What are the most common causes of P0351?
The most common causes of P0351 are: Failed or weak ignition coil, Damaged or corroded coil connector or pigtail, Broken or shorted wiring in the coil control circuit, Loss of power feed or ground to the coil, Worn or fouled spark plug overloading the coil, Failed coil driver inside the PCM/ECM. The specific cause varies by vehicle.
How much does it cost to fix P0351 on a Toyota?
Published repair estimates on Toyota range from $60 to $350 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0351 on a different make?
View P0351 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.