2004 cayenne fault codes

[ducs]

have a few codes that came up, gee what a suprise,ordered 4 new metal ignition coils, but have p1525 code, o2 sensor? front or rear?

po354 coil voltage ?

p1525-o2 gas cap?

po 441-purge valve?

any help thanks

[Loren]

P0354 Bar ignition module on cylinder 4

Possible cause of fault
The wiring might contain the following faults:
- Open circuit in signal wire
- Short circuit to B+ in signal wire
- Short circuit to ground in signal wire
- Short circuit to B+ in ground lead
- Open circuit in ground lead
- Open circuit in power supply line
- Short circuit to ground in power supply line
- Incorrect assignment of ground lead and positive lead
Following components can be affected:
- Bar ignition module faulty
- DME control module faulty

 

9 times out of 10 the coil is cracked and needs to be replaced.

 

P0441 Fuel tank ventilation system above limit value/below limit value

Possible cause of fault
- Tank vent faulty (remains stuck in an open or closed position)
- Tank vent installed the wrong way round
- Leak in scavenging lines between tank vent and positive crankcase ventilation (in the Turbo via a T-piece also on the intake side of the turbocharger)
- Scavenging lines between tank vent and positive crankcase ventilation trapped or blocked (in the Turbo via a T-piece also on the intake side of the turbocharger

 

P1525 Vehicle Electrical System Voltage via Main Relay - Signal Implausible/Open Circuit

Possible cause of fault
- Contact resistance or open circuit