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My guess is you are hearing rumors.
and now want to know what
a check engine light means, (means get it serviced)
the book on the car covers all this is you like to read.
the book is a FSM, factory service manual or SM.
i close match is at Mitchells' DIY dot com, google it.
all mech, use it. so not have to memorize , 1million DTC errors.
it the CEL lamp means get car serviced, or learn to scan it and read the book. each error is covered in the book, if you can read.
The cpu moniters all the systems you mentioned so any one of the sensors can be faulty and put the light on. In my reference book on codes OBD-11 P2 the code quoted refers to nitrogen oxide sensor bank 1 circuit malfunction causes wiring NOx sensor or heated oxygen sensor 3 bank1. Wiring short to positive---short to ground ---ECM unless the ECM controls the abs etc I would be seeking a second opinion as to the problem My reference is Auto data diagnostic trouble codes Engine management systems--2012
The auto parts store has counter people that take your money when you buy parts
Some of them may be skilled in auto repairs but you don't go there for advice
Personally I think for $60 your better off buying your own code reader & start educating yourself on OBD2 Systems. You have everything you need on the internet generically,you just don't have wiring diagrams & factory manuals you really need.
After the parts store 99% of people pay a shop or dealer to do the same code checking all over,so skip that step.
You surely can not believe that with a check light on that spark plugs are on a list of codes. There not.
Have the codes checked & use the internet to find out what they refer to. No code tells you to change a part or what is wrong with a part
You study each sensor or part & learn how to test them They have to fail a test before they need replacing,common sense
I would think ignition wires on wrong if that applies,or bad ignition coil,a timing belt that jumped a few teeth,vacuum leaks,egr valve leaking.
May be faster & cheaper to have it fix this time & be involved at the shop to learn something
po340 is camshaft position sensor A- bank 1 curcuit malfunction--p1377 is IC module cam pulse to reference. change cam sensor then you should be ok. you can go to any auto parts store and buy a haynes manual for your specific car. this book will help you.
Mitchells, Motor, Chilton, Haynes, Clymer repair manuals all have wiring diagrams. If you cant obtain one of those your local library has a reference book section that should have a auto repair manual section.
You describe a symptom that most often is related to malfunctioning / failing Throttle Position Sensor. Check engine codes and reference them to a OBD II code reader, you can use a inexpensive code reader from a Discount Auto Parts store... If code references TPS sensor replace and reset codes... hope this helps...