KEVOZS8

My car was doing ok until yesterday I got home I shut it down then after 15-20 minutes I wanted to start the car but it didn't start it cranks but does not start and this 10 fault codes appeared:
* P1509 IAC Circuit - Electrical Malfunction
* P1511 Intake Manifold Changeover Valve Circuit - Electrical Malfunction
* P1409 Tank Ventilation Valve - Electrical Malfunction
* P1201 Cylinder #1 Fuel Injector Circuit - Electrical Malfunction
* P1204 Cylinder #4 Fuel Injector Circuit - Electrical Malfunction
* P1205 Cylinder #5 Fuel Injector Circuit - Electrical Malfunction
* P1208 Cylinder #8 Fuel Injector Circuit - Electrical Malfunction
* P0560 Battery Voltage - Out of Range
* P0130 O2 Sensor Circuit - Malfunction (Bank 1 Sensor 1)
* P0150 O2 Sensor Circuit - Malfunction (Bank 2 Sensor 1)

after 1 hour wait when it cools down a little bid it cranks and starts and everything is fine I reset the codes nothing .next stop same **** happens again (10 fault code and engine doesn't start).
From where should I start ?
I have done some searches and I noticed that the voltage of the battery should be 13 Volts at least on dreading the values on the scanner is showing 13.2 A/C Off and 12.9 A/C On . Is this a problem ? but yet i didn't check the battery when the car is not starting . am I on the right route to began solving the issue ?

KEVOZS8

Yesterday I checked for leaks and I found out that a major leaks from the injectors seals
I replaced all the seals now the car runs smoother and until now no codes and the car is starting normally . Will update any if I have the same issue .

Ottoman56

I hope you figure it out and tell us about it because I am having what sounds like the same issue.
2001 allroad 2.7t

KEVOZS8

the problem was from injector seals I replaced them and the issue solved .Good Luck

KEVOZS8

After 1 month or so the same problem is there again with the same fault codes . I am just confused what to do could it be the battery ?

twentysevenlitres

Low voltage can explain a lot of issues.
Under what conditions were those voltages you originally measured? Engine running or not?

With engine off, a battery should measure around 12.6 volts, or better.
Engine running, the voltage comes off the alternator and should measure between 13.7 and 14.2 volts depending on load, rpm and alternator condition.

If it's measuring 12.9 with the engine running, you're under volts indicating an alternator fault. Under volts probably indicates under amps too, which means the battery may not be charging properly.

KEVOZS8

I have replaced the battery and taught I have solved the problem for 1 month but yesterday while I was going uphill the engine shut down for 2 seconds then hesitated the check engine light came ON misfired couple of times then after 5 to 7 seconds it went normal .I Plugged the scanner the same fault are showed except this time the P0560 Battery Voltage - Out of Range did not shown.
These are the faults:

* P1509 IAC Circuit - Electrical Malfunction
* P1511 Intake Manifold Changeover Valve Circuit - Electrical Malfunction
* P1409 Tank Ventilation Valve - Electrical Malfunction
* P1201 Cylinder #1 Fuel Injector Circuit - Electrical Malfunction
* P1204 Cylinder #4 Fuel Injector Circuit - Electrical Malfunction
* P1205 Cylinder #5 Fuel Injector Circuit - Electrical Malfunction
* P1208 Cylinder #8 Fuel Injector Circuit - Electrical Malfunction
* P0130 O2 Sensor Circuit - Malfunction (Bank 1 Sensor 1)
* P0150 O2 Sensor Circuit - Malfunction (Bank 2 Sensor 1)

I am wondering if this could be from a bad fuel Pump?

Y888

was it a tough job to replace injector seals?
did you have to take the whole metail rail out?
i am thinking pulling mines out for ultrasonic cleaning.

KEVOZS8

Yes I have rail out all the injectors and replaced the seals its an 1 hour job .

tozoM8

I would check the ground and positive cable by the starter.