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Eberspacher Airtronic 2 and 3 wiring harness Easy Scan diagnostic port cover Eberspacher CAN wiring harness diagnostic plug cover with built in resistor Required on all Eberspacher Ax2 Ax3 HS3 heater installations for error free operation Specifically required for wiring harness part numbers: 252720801100, 252652801100, 252933801100 Required on the following Eberspacher air heater models: Eberspacher Airtronic S2 D2L Eberspacher Airtronic M2 D4L, D4R Eberspacher Airtronic S3 D2L Eberspacher Airtronic M3 D4L, D4R Eberspacher Airtronic L3 D6L Eberspacher Airtronic XL3 D8L Required on the following Eberspacher water heater models: Eberspacher Hydronic S3 D4E CS, D4E CL Eberspacher Hydronic S3 D5E CS, D5E CL Please note: Resistor may be either totally exposed or entirely shrink wrapped. Pictures are for reference only. Wiring harness not included.