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All Toyota fault codes

Camshaft timing (VVT)

P1656 Oil control valve (OCV) circuit fault

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P1656 means: Oil control valve (OCV) circuit fault. The engine computer turns the camshaft using oil pressure so the valves open at the right moment. Drive gently and have the car checked soon. The repair usually costs about €80–900 in Estonia. The most common cause: oil level low, oil old or the wrong grade.

Is it safe to drive?Get it checked soonDrive gently and have the car checked soon.
Typical repair cost€80–900parts and labour in Estonia

What it means

The engine computer turns the camshaft using oil pressure so the valves open at the right moment. Right now the camshaft isn't where the computer wants it, or the computer can't drive the control valve properly.

This is a make-specific code (Toyota). The exact meaning can vary by model and year.

What you may notice

  • Engine light on
  • Rough idle
  • Less power, especially at low revs
  • Higher fuel consumption

What could be wrong

  1. 1Oil level low, oil old or the wrong grade
  2. 2Control valve sticking or its screen blocked
  3. 3Worn camshaft phaser
  4. 4Stretched timing chain

Repair difficulty: Moderate

What you can check yourself

Check the oil level first and when it was last changed. Old oil is the most common cause of this fault. You can check the simple things yourself, but the repair is best done in a workshop.

How we fix it

  1. We check the oil and compare actual and target cam position on the diagnostic tool
  2. We clean or replace the control valve
  3. If the chain has stretched, we replace the chain kit

Standard SAE description: OCV Circuit Malfunction

This code usually comes with: Check engine lightSee what the light means →

Related symptoms: Rough idle or engine stalling

Want a definite answer?

Bring the car to our workshop in Estonia for diagnostics. We read the fault codes, test the sensors and tell you what is wrong. Repair price depends on the work involved, generally €45 per hour.

Book a diagnostic check

Questions

What does fault code P1656 mean?

Oil control valve (OCV) circuit fault. The engine computer turns the camshaft using oil pressure so the valves open at the right moment. Right now the camshaft isn't where the computer wants it, or the computer can't drive the control valve properly.

Can I drive with code P1656?

Drive gently and have the car checked soon.

How much does it cost to fix P1656?

Roughly €80–900 in Estonia. The price depends on exactly what has failed and on the car.

How is P1656 fixed?

We check the oil and compare actual and target cam position on the diagnostic tool. We clean or replace the control valve. If the chain has stretched, we replace the chain kit.

Related codes

P0020Camshaft actuator: circuit fault ("A", bank 2)P0021Intake camshaft timing too far advanced (bank 2)P0022Camshaft: timing too far retarded ("A", bank 2)P0010Fault in the camshaft adjuster valve wiring (intake)P0011Intake camshaft timing too far advancedP0012Intake camshaft timing too far retardedP1520Exhaust VANOS (camshaft adjustment) not working properlyP1523VANOS solenoid circuit fault

Based on AI combined with our hands-on workshop experience and knowledge. This information is general and prices are approximate (Estonian workshop rates). The same code can mean different things on different cars. Only an inspection of the car gives a definite answer.

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