Cayenne s v8 2008 code p12a1 and p1026

[Nabeel Al-rasheed]

Hello everyone 

i have Cayenne s v8 2008 code p12a1 and p1026 showing COD I have started to  experience car stalling when I give it gaz for the pass month and now light Engine on and turn off the car can’t really drive with it and ideas what could be wrong  

[Loren]

 

P12A1

 

Possible fault causes

• Predelivery quantity or pressure in fuel low-pressure circuit too low
• Fuel high-pressure system leaking
• Fuel high-pressure sensor faulty
• Fuel high-pressure pump faulty

 

P1026

 

Possible fault causes

• Only if the value is below the lower limit:
•  Predelivery quantity or pressure in fuel low-pressure circuit too low
• Tank (almost) (driven) empty
• If the value is below or exceeds the limits:
• Quantity control valve faulty (in fuel high-pressure pump)
• Fuel high-pressure pump faulty

[niaditmas]

On 10/16/2019 at 7:31 PM, Loren said:

 

P12A1

 

Possible fault causes

• Predelivery quantity or pressure in fuel low-pressure circuit too low
• Fuel high-pressure system leaking
• Fuel high-pressure sensor faulty
• Fuel high-pressure pump faulty

 

P1026

 

Possible fault causes

• Only if the value is below the lower limit:
•  Predelivery quantity or pressure in fuel low-pressure circuit too low
• Tank (almost) (driven) empty
• If the value is below or exceeds the limits:
• Quantity control valve faulty (in fuel high-pressure pump)
• Fuel high-pressure pump faulty

so would this be the pump on the back of the cylinder?   or the fuel pump?

[Loren]

Low fuel pressure - either a leak or a worn out fuel pump.