Hello there, I am new to this forum. I recently acquired a 2002 Beetle 2.0L manual trans with 180k on the clock. Got it cheap, and it runs fantastic aside from a few intermittent issues. Occasionally it will be running fine and suddenly it will lose half its power. Like a switch was flipped. I have run some tests with my Ancel gauge, and done a lot of reading here on the forums. I have two codes, a dreaded P0420, and a cylinder 3 misfire P0303. Rather than throw any parts at the problem (yet), I decided to check the thermostat temps. Only runs at 185 degrees F, and I have read thats just not hot enough for this engine. Maybe its running rich? I have very little service history, but I was told the injectors, ignition coils, and such were all replaced. No word on oxygen sensors or cat. I am new to the VW world, so I appreciate any input as to where to start narrowing the problem down.