Strange CEL p 1671
 

I recently got a CEL and the code came back as 1671. Anybody ever dealt with this one? I looked it up and came up with two possibilities: ECU fault or engine compartment fan. There has been no change in the way the car runs.

can you see if you can activate the engine compartment fan with your durametric? good way to test to see if it is working ..

From the 7.8 DME Manual:
P1671
DME relay/control module faulty (computer monitoring: reset) – signal implausible


Possible fault cause
◆ Undervoltage
◆ DME relay faulty
◆ DME control module faulty
This fault may be entered if the control module has been operated with undervoltage.
Affected terminals
I/1 and I/8
Diagnosis/troubleshooting
Note!
• If no fault is present, erase the fault memory.
1) Check voltage supply, terminal 15
◆ Measure voltage between pin I/1 and ground.
> 11 V
2) Check DME relay ◆ Switch on the ignition
◆ Measure voltage between pin I/18 and ground
Battery positive voltage
Check triggering of DME relay
Replace DME relay
3) Replace DME control module.
4) Perform adaptation. ◆ Switch on the ignition
◆ Wait one minute
◆ Do not press the accelerator
◆ Switch off the ignition for at least 10 seconds
◆ Read out the fault memory
-> End -> End

Hi, a have this same problem with fault 1671 and my car is not interested to start :) Do you solved your problem?