{"product_id":"1-8t-mk4-wire-tucked-complete-engine-harness-awp-aww-bea-bam-v2","title":"1.8T MK4 Wire Tucked Complete Engine Harness AWP, AWW, BEA, BAM - V2","description":"\u003cp style=\"text-align: left;\"\u003e\u003cstrong data-start=\"241\" data-end=\"253\"\u003eStage 1:\u003c\/strong\u003e\u003cbr data-start=\"253\" data-end=\"256\"\u003eThis entry-level option includes the essential 40-pin ECU engine harness. Designed for compatibility with the factory 81-pin side harness, it's ideal for those looking to clean up their engine bay while retaining OEM-side wiring.\u003c\/p\u003e\n\u003cp data-start=\"487\" data-end=\"844\"\u003e\u003cstrong data-start=\"487\" data-end=\"499\"\u003eStage 2:\u003c\/strong\u003e\u003cbr data-start=\"499\" data-end=\"502\"\u003eThe Stage 2 setup includes both the 40-pin engine harness and an 81-pin interface harness. This extended configuration incorporates critical circuits including the O2 sensor, Main ECU Relay, Fuel Pump Relay, Starter Signal, Reverse Lights, Mass Airflow Sensor, and Coil Power Input. It's a complete solution for more extensive rewiring needs.\u003c\/p\u003e\n\u003chr data-start=\"846\" data-end=\"849\"\u003e\n\u003cp data-start=\"851\" data-end=\"1219\"\u003e\u003cstrong data-start=\"851\" data-end=\"880\"\u003eBuilt for Track or Street\u003c\/strong\u003e\u003cbr data-start=\"880\" data-end=\"883\"\u003eWhether you're building a dedicated track car or maintaining a reliable daily, this harness is constructed using high-temp PTFE Teflon wire, rated for environments from -90 °C to 260 °C. Each connector is clearly labeled for straightforward installation and serviceability, allowing engine-side work without removing the entire harness.\u003c\/p\u003e\n\u003cp data-start=\"851\" data-end=\"1219\"\u003eSince VW decided to discontinue factory ECU connectors and pins, we partnered with TE Connectivity to source all genuine ECU pins and implement a new-age, modern sealed-leavy-seal connector. It not only looks cleaner and more compact but also offers improved performance and long-term availability—ensuring we can continue building and supporting these harnesses reliably.\u003c\/p\u003e\n\u003cp data-start=\"1221\" data-end=\"1514\"\u003eThe loom includes an integrated Fuel Pump Relay to support auxiliary pump setups—ideal for surge tanks or high-demand fuel systems. You’ll also find a detachable coil harness section, injector plugs, N75 wiring for those still running boost control, and a MAF lead for setups that retain it.\u003c\/p\u003e\n\u003cp data-start=\"1516\" data-end=\"1702\"\u003eA dedicated secondary wideband input is placed in the OEM underbody location, with the top-side connector ready to feed directly to your AFR gauge—no need to run wires through the cabin.\u003c\/p\u003e\n\u003cp data-start=\"1516\" data-end=\"1702\"\u003e \u003c\/p\u003e\n\u003ch2 data-start=\"1516\" data-end=\"1702\"\u003e\u003cstrong\u003eConnector Abbreviation Overview:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"1516\" data-end=\"1702\"\u003e\u003cbr\u003e\u003cstrong\u003e40 Pin ECU Connector:\u003c\/strong\u003e\u003cbr\u003eIgnition Coils (1-4)\u003cbr\u003eINJ1, INJ2, INJ3, INJ4 (Fuel Injectors)\u003cbr\u003eVSS (Vehicle Speed Sensor)\u003cbr\u003eN75 (Boost Control Solenoid - Resistor required if removed)\u003cbr\u003eIAT (Intake Air Temp Sensor)\u003cbr\u003eBT (Throttle Body)\u003cbr\u003eOIL (Oil Pressure Switch)\u003cbr\u003eCRANK (Crankshaft Position Sensor)\u003cbr\u003eMAP (Boost Pressure Sensor - Choose stock location or under the intake manifold, one must be used)\u003cbr\u003eECT (Coolant Temp Sensor)\u003cbr\u003eKS2 (Knock Sensor Cyl 3-4)\u003cbr\u003eKS1 (Knock Sensor Cyl 1-2)\u003cbr\u003eCAM (Camshaft Position Sensor)\u003cbr\u003eCOILS (Ignition Coil Expansion Harness)\u003cbr\u003eN249 (Resistors Included)\u003cbr\u003eCOIL 12V (Ignition Coil Power output)\u003cbr\u003eCHASSIS (Multi-Pin Connector Near the Battery in factory location)\u003cbr\u003eGROUND (Chassis Ground)\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003e81 Pin ECU Connector:\u003c\/strong\u003e\u003cbr\u003eN112, N80 (Resistors Included)\u003cbr\u003eECU (Main ECU Relay)\u003cbr\u003eFP AUX (Additional Fuel Pump Relay)\u003cbr\u003eWideband (Main O2 Sensor - 6 Pin connector, suitable for AFR gauge hookup, LSU 4.9 O2 Sensor Compatible Gauges)\u003cbr\u003eFP 12V IN (12V+ Ignition Source for powering the AUX fuel pump - Optional, run the expansion harness down to the terminals inside the car, connects to 75xx Yellow Terminal or the Battery direct)\u003cbr\u003eFP 12V OUT (12+ Ignition Output for the AUX Fuel pump, connects directly to the positive terminal on the AUX pump - Optional)\u003cbr\u003eGROUND (Chassis Ground)\u003cbr\u003eST (Starter Signal)\u003cbr\u003eREV (Reverse Lights)\u003cbr\u003eMAF (Mass Airflow Sensor)\u003cbr\u003eCOIL 12V (Ignition Coil Power input)\u003cbr\u003eO2 Sensor - Main ECU O2 sensor OE sensor should be used.\u003cbr\u003eO2 AUX - Secondary O2 sensor for an AFR gauge (optional)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e***PLEASE NOTE: THIS HARNESS IS FOR WIDEBAND ECU'S ONLY, IF YOU HAVE AN AWD, AMU, APX ENGINE CODE YOU WILL NEED AN AWP, OR AWW ECU TO FUNCTION CORRECTLY. Version 2 does not include a firewall disconnect, we have removed it to prevent connection issue and shielding issues for Crank, and Knock Sensors.\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eIn some instances with some ECU's you may observe intermittent open circuit ghost codes for ignition coils, you must have your tuner remove these codes to clear the CEL. The codes do not affect performance of the vehicle, or the harness.\u003cbr\u003e\u003cbr\u003eP1355 - 17763 - Cylinder 1 Ignition Circuit (Open Circuit) Intermittent\u003cbr\u003eP1358 - 17766 - Cylinder 2 Ignition Circuit (Open Circuit) Intermittent\u003cbr\u003eP3631 - 17769 - Cylinder 3 Ignition Circuit (Open Circuit) Intermittent\u003cbr\u003eP1364 - 17772 - Cylinder 4 Ignition Circuit (Open Circuit) Intermittent\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/mvrmCffaMdE?si=IUztX1vKpAg9UOHy\" height=\"315\" width=\"560\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Carrot Top Tuning","offers":[{"title":"Stage 1 - Engine Loom Only 40 Pin \/ Drivers Side (225HP TT)","offer_id":48977096868023,"sku":"ME7.5-40P-MK4-TT225-EXT","price":725.0,"currency_code":"USD","in_stock":true},{"title":"Stage 1 - Engine Loom Only 40 Pin \/ Passenger Side (Standard US SPEC)","offer_id":48977096900791,"sku":"ME7.5-40P-MK4","price":675.0,"currency_code":"USD","in_stock":true},{"title":"Stage 2 - 40 Pin + 81 Pin \/ Drivers Side (225HP TT)","offer_id":48977096933559,"sku":"ME7.5-40P-MK4-ME7.5-81P-MK4-TT225-EXT","price":1150.0,"currency_code":"USD","in_stock":true},{"title":"Stage 2 - 40 Pin + 81 Pin \/ Passenger Side (Standard US SPEC)","offer_id":48977096966327,"sku":"ME7.5-40P-MK4-ME7.5-81P-MK4","price":1100.0,"currency_code":"USD","in_stock":true},{"title":"81 Pin Only \/ Drivers Side (225HP TT)","offer_id":48977096999095,"sku":"ME7.5-81P-MK4-TT225-EXT","price":675.0,"currency_code":"USD","in_stock":true},{"title":"81 Pin Only \/ Passenger Side (Standard US SPEC)","offer_id":48977097031863,"sku":"ME7.5-81P-MK4","price":625.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0574\/6429\/1511\/files\/IMG_9448_36b62125-29c8-47fc-9af9-4262d698ba78.jpg?v=1786325398","url":"https:\/\/milkymotorsports.com\/products\/1-8t-mk4-wire-tucked-complete-engine-harness-awp-aww-bea-bam-v2","provider":"Milky Motorsports","version":"1.0","type":"link"}