DTC 78

LEXUS does not provide diagnostic trouble code testing procedures for these codes (Speed Sensor Check - DTC's C1271 - C1279, C1281 - C1283, 71 - 79 and 81 - 83) refer to Speed Sensor for further testing.

Speed Sensor / C1271/71 - C1283/83:

Or refer to "trouble area" on the Speed Sensor function chart for further clarification.