2005 Toyota Yaris

[kilon]

Variant SCP12(H) 1.3L

I have a vehicle with code P1346 - VVT sensor/camshaft position range performance problem.

What diagnosis can I do myself before getting a mechanic to look at it.

I did notice the code on purchase but seeing as the car drove great I ignored it plus it was cheap.

Where should I start to diagnose this. Obviously check around the sensor and do some basic multimeter checks on the wires etc.

But what else can be done? Should I inspect the chain. If so what am I looking for?

The code comes back immediately after being cleared so it's not going away.

Drives completely fine although idle is a bit weak but it doesn't cut out. First one I've owned so it could just be a Yaris thing I dont know. But I do remember an odd in and out vibration when idling and it goes almost silent as if the engine is going to cut out, hard to explain.

It was sold to me like this with tape over the engine light which I didn't notice at the time but i did spot the code as I had techstream and a laptop with me but ignored it due to it driving fine.

Also monitors for o2 and catalyst show as incomplete pretty sure they were showing that before clearing codes. Don't know what to make of it yet.

My main issue is getting rid of this P code.

What should I be checking?