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Ek20 Engine Swap Wiring Harness

The WRX passenger's side firewall grommet contains wires for the MAF, boost control solenoid, EGT probe, front O2 sensor, and passenger's-side tumble generator valves. You should be able to strip this portion of the harness down until it's one clean bundle from these connectors to the ECU.
Subaru EK20 Hybrid How-To - Engine Swap

 The WRX passenger's side firewall grommet contains wires for the MAF, boost control solenoid, EGT probe, front O2 sensor, and passenger's-side tumble generator valves. You should be able to strip this portion of the harness down until it's one clean bundle from these connectors to the ECU.  View Related Article

 

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