New Holland 3721: Lambda Sensor SPI Chip Error

The fault code indicates an issue with the SPI chip of the lambda sensor. The system has detected a fault in the communication or functionality of the SPI chip within the lambda sensor.

1. 1

   The connection and wiring of the lambda sensor

2. 2

   The integrity of the SPI chip within the lambda sensor

3. 3

   The signal output from the lambda sensor

1. 1

   Inspect the wiring and connections of the lambda sensor

   Check for any loose, damaged, or corroded connections related to the lambda sensor.

2. 2

   Test the lambda sensor signal

   Use a diagnostic tool to monitor the signal output from the lambda sensor and compare it to expected values.

3. 3

   Replace the lambda sensor if necessary

   If the SPI chip is confirmed to be faulty, replace the lambda sensor with a compatible unit.