Po420 code jeep grand cheroke

Question

Got a p0340 cam shaft position sensor code. Replaced ran fine for about a week, now getting same code along with p0420 catalyst system efficiency code...

Answer 1

When this code set P0340 there is no camshaft position signal at the PCM, this one has to be tested at the  camshaft signal and verify that a signal is produced if the signal is produced the PCM is faulty, P0340 if it is accompanied by a stumble when accelerating and a hard to start event, this would be the PCM,

Read more : https://www.autocodes.com/p0340.html