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Troubleshooting Guide - Holley

Troubleshooting Guide - Holley

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Jul 28, 2017 · CTS (Coolant Temperature Sensor) – Reads engine temperature. With a cold engine it should read similar to the MAT sensor. If the indicator reads “LOW Err” double check the connection to the CTS. AFR (Oxygen Sensor) – Initially should show “Heating”. Without the engine running, AFR will read 35.6 AFR (Air Fuel Ratio).

  Sensor, Coolant, Holley

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