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P0021 Audi P0021 Audi - 'A' Camshaft Position Timing Over-Advanced Or System Performance Bank 2

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Possible causes
- Dirty engine oil

- Low engine oil level

- Faulty camshaft actuator

- Camshaft actuator circuit open or shorted

- Camshaft actuator circuit poor electrical connection

Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)

- Lack/Loss of power

- Engine rough idle

 
 
P0411 Audi P0411 Audi - Secondary Air Injection System Incorrect Flow Detected
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Possible causes
- Faulty Vacuum hoses damaged

- Faulty Air Pump inoperative

- Air bypass solenoid harness is open or shorted

- Air bypass solenoid circuit poor electrical connection

- Air bypass solenoid leaking/blocked or stuck open/closed

- Air diverter valve leaking/blocked or stuck open/closed

When is the code detected?
The secondary air injection system does not detect the presence of air in the exhaust when introduced by the secondary air injection system.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)

- Engine hesitation

P0411 Audi Description

An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module (PCM) grounds the Air pump relay control circuit which energizes the Air pump. The PCM also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. The PCM enables both circuits simultaneously when Air system operations id desired. When the AIR system is active, then Air pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction.

 
 
 
P0010 Audi P0010 Audi - 'A' Camshaft Position Actuator Circuit Bank 1
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Possible causes
- Dirty engine oil

- Camshaft Position Actuator Circuit is open or shorted

- Camshaft Position Actuator Circuit poor electrical connection

- Faulty Camshaft Actuator

Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
 
 
 
P0020 Audi P0020 Audi - 'A' Camshaft Position Actuator Circuit Bank 2
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0 comments.png |  Add Comment
Possible causes
- Faulty Camshaft Actuator

- Dirty engine oil

- Camshaft Position Actuator harness is open or shorted

- Camshaft Position Actuator circuit poor electrical connection

Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)

- Lack/Loss of power

- Engine rough idle

    VW Passat 2.0TDI  2006

 X Audi S6 2,2 20VT  1997

 X Audi A6 2,5TDI Quattro 2001

 X Audi A6 2,5TDI Quattro 1996

 X Mitsubishi Pajero 3000 Fjallasport 1992

 X mitsubishi Pajero 3000 1991

 X Volvo V70XC 2,5T 1998

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