Hi, Recently, I've finished my H22 swap into 92 Accord. Million thanks for TeamUrbanChaos, TAB and many others. Now I have another question here. There is a 41 code that I checked it stands for O2 Heater circuit malfunction. My question are: 1. What's the difference between Code 1(O2 defective) with Code 41(O2 Heater Circuit malfunction)? If the wiring was wrong, why no Code 1 came out? 2. Before I connected my exhaust pipe, the code 41 did not show up. But after, it jumps out. Could you guys explain why? 3. If says the O2 wiring is simple enough, does a better bet that the O2 sensor was gone? TIA. Also looking for new exhaust system, any suggestion?