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I wired in all 4 wires from the secondary O2. but the code 41 affects which sensor? Primary or secondary?

I just installed a 98 EX motor into my 99 DX body. And i installed the ecu jumper harness and had to swap out the primary O2 sensor with one with correct connector and spliced in the secondary O2 sensor it into the harness. Now its running a little rough when its out of gear and throwing CEL...

I just installed a 98 EX engine into my 99 DX body so i had to use a OBD2B to OBD2A ecu jumper. I used a 99 ex harness to elimanate wiring in V-Tec. But by doing that the harness doesn't have any second O2 sensor wires on it it's on the 99-00 ex/si cabin harness which i don't have. So i have to...

So CEL will be on until i get the right one? But will it idle correctly?

I'm swapping a OBD2A engine into my OBD2B car and i'm using the ecu jumper. My question is i can't find my M/T ECU for the new engine but i have a A/T ecu laying around for the same year engine. My question is will the A/T ECU work even though im using a M/T engine and harness which doesn't plug...

Hello. I have a 99 DX and i swapped in a 98 EX VTEC. Just to get it running i had to splice connectors from both engines and use my old ECU. So now i have a loping idle and a CEL and VTEC is not hooked up. Now i learned the 98 EX is a OBD2A and my 99 body is OBD2B and i need a ECU jumper harness...

I have a 99 Civic DX manual tranny and my friend and I installed a 98 EX VTEC engine with a manual tranny ECU. Im using my stock DX ECU cause the EX ECU wouldn't plug in to the existing cars wiring. Now i have a loping idle problem cause we spliced the harness alot just to get the thing running...