P0011 on a Toyota Corolla

What P0011 usually means on a Corolla

P0011 on a Corolla means the intake camshaft is over-advanced on bank 1 — the VVT-i system has drifted from its commanded position. On Toyota's VVT-i fours this typically comes down to the camshaft timing oil control valve (OCV) sticking, or its filter screen clogging with sludge, both driven by dirty or neglected oil. Symptoms include a rough idle, hesitation, and sometimes a brief rattle at startup.

Most likely causes on this model

1. Stuck camshaft timing OCV

   A sludge-jammed oil control valve is the classic Toyota VVT-i cause and often a cheap fix.

2. Clogged OCV filter screen

   The tiny screen behind the valve traps sludge from skipped oil changes and starves the actuator.

3. Dirty or low oil

   VVT-i depends on clean oil pressure, so neglected oil underlies most P0011s.

4. Worn VVT actuator

   On high-mileage engines the cam phaser wears and can't hold commanded timing.

What it costs on a Corolla

The oil control valve is a modest part and easy to reach on the Corolla's four, so this is an affordable repair when the valve is the cause. A correct-viscosity oil change plus a cleaned screen fixes many cases outright. A worn cam actuator is the pricier scenario since it's part of the timing drive.

Fixing it

Change the oil to the correct grade, then inspect and clean or replace the camshaft timing OCV and its screen — sludge there is the common cause on 1ZZ-FE and 2ZR Corollas. Save the cam actuator for last, only if the valve and screen are clean.

For the full step-by-step diagnosis order (any vehicle), see the main P0011 guide.

Other codes we cover on the Toyota Corolla

Toyota Corolla problems & recalls by year