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So I killed my 2002 Civic EX engine and swapped it with a 2005 civic HX. Car has been running great with the new engine after I swapped the ECU. Only problem is I am using the ex exhaust and when I swapped the 02 sensors on ,bank 1 sensor 1 ,and bank 1 sensor 2 then check engine light came on and dose not go away even after swapping for new sensors. So my question is there a wiring difference between the 2002 civic 02 sensors and the 2005 civic.


And I am using the ex exhaust on the HX engine.

 
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03-05 uses a wideband downstream (unsure about upstream) O2 sensor. 01-02 uses narrow band.

 
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So would I need to make a new wiring harness for the 05 senors

 
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swap in 05 sensors and you should be fine. Same connectors, same threads, different sensor portion. Wideband sensors will be significantly more expensive, just saying. Also, the D17 doesn't play nice with "universal" splice your own wiring sensors. Buy plug and play ones

 
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So only problem I have is it is a 2002 ex exhaust and 2002 wiring harness

 
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ecu vs sensors.

Just so we're on the same page, 05 engine, 05 ecu, 02 wiring harness, 02 sensors?

 
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05 engine, 05 ecu, 05 dx o2 sensors , 02 wiring harness

 
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The HX ECM (or pcm) should be looking for THREE different oxygen sensors, so you will never get rid of all the fault codes.