P3551 Audi Auto Trouble Code
Parts or components should not be replaced with reference to only a P3551 Audi DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.
The problem is caused by the variable cylinder management system switching on and off during light throttle conditions, at cruising speeds, or when driving on flat roads. The constant switching causes excessive oil consumption and the trouble codes appear when oil pressure drops to the point where it can no longer operate the VCM system.
P3551 Audi Possible Solution:
Air Conditioning Pressure Sensor (ACP) Insufficient Pressure Change Each time the A/C clutch engages, the PCM is looking for a pressure change in the refrigerant. If the change in pressure is outside of the calibration the DTC will set. A/C system mechanical failure Open ACP or VREF circuit A/C sensor damaged A/C system electrical failure A/C clutch always engaged Verify A/C system function, including refrigerant charge.
P3551 Audi Description For All Models :
- Audi 100
- Audi 200
- Audi 4000
- Audi 50
- Audi 5000
- Audi 60
- Audi 75
- Audi 80
- Audi 90
- Audi 920
- Audi A1
- Audi A2
- Audi A3
- Audi A4
- Audi A5
- Audi A6
- Audi A7
- Audi A8
- Audi Ad
- Audi Allroad
- Audi C
- Audi Cabriolet
- Audi Concept
- Audi Coupe
- Audi Q3
- Audi Q5
- Audi Q7
- Audi Quattro
- Audi R8
- Audi Rs2
- Audi Rs3
- Audi Rs4
- Audi Rs5
- Audi Rs6
- Audi S1
- Audi S2
- Audi S3
- Audi S4
- Audi S5
- Audi S6
- Audi S8
- Audi Sq7
- Audi Tt
- Audi Ur
- Audi V8
- Audi Variant
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P3551 Audi Trouble Repair :
If your vehicle failed a P3551 Audi test and the P3551 Audi Check Engine Light is NOT on, chances are you have a problem with the OBDII system, a burned out MIL lamp, or a faulty catalytic converter. The converter is essentially an afterburner that cleans up the exhaust after it exits the engine. The OBDII system uses a ownstream oxygen sensor to monitor the efficiency of the converter, and it should detect a drop in converter efficiency if the converter has been contaminated or is failing (ignition misfiring, leaky exhaust valves, and oil burning can all damage the converter). What you want to look any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression. Use your OBD Express DIY to look at the oxygen sensor outputs, coolant temperature, airflow, calculated engine load, and inlet air temperature. |
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