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  1. UPDATE: I did the block test and it was negative. Then used a long screwdriver to feel for vibration and it's definitely coming from the catalytic converter so I'll just swap that out. Was hoping to get by with O2 swap, but I guess that's what I get for driving with that code on 🙂
  2. I have a 2005 Honda Civic 1.7l manual transmission with 154,000 miles that does not get driven all that often. 2 years ago had major tune up...plugs, coils, timing belt, water pump, new clutch, etc. About 2 weeks ago I replaced the upstream and downstream O2 sensors with Denso sensors because I had been getting a P0420 emission threshold efficiency code for about the last year. That appeared to resolve the engine codes and has been running fine. Fast-forward to yesterday and I noticed that when revving the engine beyond about 1,700 rpm or so and releasing the throttle it makes a horrib
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