What does code P0340 mean?
P0340 means there is a fault in the camshaft position sensor 'A' circuit. This sensor tells the computer which cylinder fires when. Without it, the car may be slow to start, jerk or stall.
Why does code P0340 appear?
- The camshaft sensor has failed.
- The sensor's wire or plug is loose or damaged.
- The timing belt or chain has stretched or slipped. This is serious.
- An engine computer fault. This is rare.
What can you safely check for P0340?
- With the engine off, check the battery terminals: they should be tight, with no white or green corrosion on them.
- Write down every code the scanner shows, not just this one. Do it before clearing them, because the other codes help the mechanic find the real cause faster.
- Tell the mechanic when the timing belt was last changed.
Is it safe to drive with P0340?
If the car starts easily and runs normally, drive it gently straight to a mechanic. If it is hard to start, stalls or the engine makes a knocking or rattling noise, don't drive it; call a mechanic to where it is.
Safety: never remove the radiator cap on a hot engine; boiling coolant can burn you. Keep your hands away from the fan and belts while the engine runs. If you smell fuel, switch off, keep any flame or cigarette away and call a mechanic.
When should you call a mechanic?
If this code appears, have a car mechanic (mistri) check it soon. They will test the sensor and wiring and also check the timing, because a timing fault can damage the engine.