*** repair the issues (we can help) and have it inspected somewhere else.
start a thread here for each issue like "MAF sensor check engine light XYZ01" and post the actual code from the computer (not what someone tells you it is, give the numbers).
never mention an engine swap, there's no point. there's probably 10,000 federal laws/restrictions broken by people on this forum. emissions equipment, engine swaps, light intensity, safety items, disabling of ABS, custom exhaust (you can buy on ebay), O2 delete and bypass (also availlable on ebay), "test pipes", "off road only" lights and equipment, SRS delete..and on and on. i'm scared, the FED is no doubt going to shut down every auto forum for their rampant promotion of federal violations.
the car should be simply repaired first - if it has a check engine light then don't get it inspected until that's fixed.
a "communication error" means the swap wasn't done properly or something else is wrong....that's not normal nor an artifact of the swap...maybe incorrect/improper work during the swap, but not because of it. this one might be tough as it's nearly unheard of and not something that typically happens....will be hard to track. but i'd start a thread and give some details into what engine was swapped, who did it, etc.
the P0420 code (the cat converter code no doubt) does not require replacing the converter. but you'll need to listen to help from here because you won't find a competent mechanic to diagnosis...other than simply covering it up with a new conveter $$$$ .
same with MAF code - it simply needs repaired.
Edited by grossgary, 15 June 2013 - 12:31 AM.