E39 / P0178 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE lamp on.
Ethanol Sensor Circuit, Low Input
Fault symptom
CHECK ENGINE lamp on.
On-board diagnosis
Type of diagnosis:
Enable criteria:
Fault criteria:
| When the frequency is lower than 45 Hz for more than 6 seconds. |
System reaction to a fault:
| The control module uses an ethanol content of 40% as a substitute value. |
Checking the wiring harness
Jiggle the wiring harness at several points to detect intermittent breaks or short circuits. Check also the connector for oxidation or loose pins.
Diagnostic help
Diagnosis regards:
| Electrical fault in connecting leads or component. |
Functions in the diagnostic tool related to the fault:
| (See also description of readings/activations in diagnostic tool) |
