Hyundai Repair: elantra check engine, oxygen probe, efficiency problem

Question
hi!
i got the  "check engine" light on with the 422 444 343 codes. the mechanics told me that they have to replace all the manifold + oxygen probe for 1500$. the car seems to run gust fine. is the price seems right for those codes?

Answer
P0422 indicates there's a catalyst efficiency problem.  Depending on the year and engine of your Elantra, the manifold converter comes as an assembly with the manifold attached.  $1500 sounds like it may be a little high, but not out of the believable range.  

P0444 is unrelated to the converter and indicates a problem with the electrical circuit for the purge control vavle.

P0343 indicates a reading from th cam sensor that's too high.  Normally, when the sensor fails, code P0340 sets, so I'd expect you may have a wiring problem here.  This, too, is unrelated to the converter.