I'm new to the forum, but before signing up, I read through numerous questions about the 420 trying to find answers. I apologize if this thread duplicates any prior thread. I'm just looking for help.
My 2002 Passat 1.8T is throwing the 420- code, and I need to pass emissions within the next two weeks. I believe that I can put the cat on myself, but I want to make sure that the Cat is the problem, and that I buy the right replacement for it.
I have spoken with a number of mechanics, and the consensus opinion is that the cat needs to be replaced. The dealership wants $1300, and I've gotten two more quotes at about $900, and one at $648. At those prices, I'd rather buy one and do it myself. I've seen a couple of links here on the forum to specific cats, but I'm hesitant to buy one without knowing for sure it's the one I need. Or if I need it at all. Which one of these two is the best? Are these "aftermarket"?
2001-2005 VW Passat Catalytic Converter for L4 1.8L Turbo (engine ID AWM) at 1AAuto.com
1998-2005 Volkswagen Passat Catalytic Converter - Exhaust - Bosal 98-05 Passat Catalytic Converter - 7436-05017903 - PartsGeek
I should mention that the "coolant inlet" was recently replaced, and I've wondered if the mechanic who did that could have left a vacuum line loose that might be causing the code.
I also wonder if unplugging the negative battery cable might clear it as well (long enough for me to get it through emissions).
Getting it off the ground could be an issue, I know. But for a lot less than $648 I could buy a cat and ramps and a decent floor jack.
What's the difference between direct fit and oem or are the two synonymous?
Thanks in advance,