{"product_id":"rywire-b16a-obd0-vtec-ecu-sub-harness","title":"Rywire B16A OBD0 VTEC ECU Sub Harness for 88-91 CRX","description":"\u003cul\u003e\n\u003cli\u003eB16A Swap Compatible \u003c\/li\u003e\n\u003cli\u003eWorks on 88-91 CRX HF\/Si \u003c\/li\u003e\n\u003cli\u003eNo Hacking Your Factory Harness \u003c\/li\u003e\n\u003cli\u003eAdds VTEC Wiring to OBD0 CRX \u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- split --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli\u003e\u003ca class=\"active\" href=\"#Description\"\u003eDescription\u003c\/a\u003e\u003c\/li\u003e\n \u003cli\u003e\u003ca href=\"#VehicleFitment\"\u003eVehicle Fitment\u003c\/a\u003e\u003c\/li\u003e \u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\n\n\u003cli class=\"active\" id=\"Description\"\u003e\n\u003ch3\u003eRywire B16A OBD0 VTEC ECU Sub Harness - 1988-1991 Honda CRX\u003c\/h3\u003e\n\n\u003cp\u003eIf you're swapping a B16A into your 1988-1991 Honda CRX, this Rywire sub harness is what adds the VTEC wiring the OBD0 chassis never had. The 88-91 CRX HF and Si came with non-VTEC engines, so the factory OBD0 harness is missing the circuits a B16A needs to run VTEC and its extra sensors. This sub harness fills that gap, adding the wires for your VTEC solenoid, VTEC oil pressure switch, secondary oxygen sensor, and knock sensor so the B16A functions the way it should.\u003c\/p\u003e\n\n\u003ch4\u003eWhy You Need It\u003c\/h4\u003e\n\n\u003cp\u003eA B16A is a VTEC engine, and VTEC doesn't just bolt on electrically. The engine needs the ECU to control the VTEC solenoid, read the VTEC oil pressure switch to confirm it actually engaged, and monitor the knock sensor and secondary O2 sensor. The factory HF\/Si OBD0 wiring doesn't run any of those, so without this sub harness you'd be splicing in circuits by hand. This kit adds them cleanly instead, so the swap keeps full VTEC function and proper sensor feedback.\u003c\/p\u003e\n\n\u003ch4\u003eWhat It Adds\u003c\/h4\u003e\n\n\u003cul\u003e\n  \u003cli\u003eVTEC solenoid wiring\u003c\/li\u003e\n  \u003cli\u003eVTEC oil pressure switch wiring\u003c\/li\u003e\n  \u003cli\u003eSecondary (2nd) oxygen sensor wiring\u003c\/li\u003e\n  \u003cli\u003eKnock sensor wiring\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eFitment\u003c\/h4\u003e\n\n\u003cp\u003eBuilt for the 1988-1991 Honda CRX (HF\/Si) with a B16A swap, OBD0. It's the sub harness for exactly this conversion, adding the VTEC and sensor circuits the OBD0 CRX was never wired for. Confirm your chassis and ECU setup before ordering.\u003c\/p\u003e\n\n\u003cp\u003eIf you're doing a B16A swap in an 88-91 CRX, this sub harness is the clean way to get VTEC and the supporting sensors wired in without hacking your factory OBD0 harness. Add it to the swap and the engine's VTEC side works the way it's meant to.\u003c\/p\u003e\n\u003c\/li\u003e\n\n \n\u003cli id=\"VehicleFitment\"\u003e\n \u003cp\u003e1988-1991 Honda CRX HF\/Si\u003c\/p\u003e \n\u003c\/li\u003e\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\u003c\/ul\u003e\n","brand":"Rywire","offers":[{"title":"Default Title","offer_id":69062392512546,"sku":"RYW-SUB-OBD0-B16","price":55.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2218\/5701\/files\/5c29da7baca35cb280fe2383f0f6dd8f.jpg?v=1792609517","url":"https:\/\/www.hybrid-racing.com\/products\/rywire-b16a-obd0-vtec-ecu-sub-harness","provider":"Hybrid Racing","version":"1.0","type":"link"}