This has many names - Boost pressure sensor, charge air pressure sensor, MAP sensor and it is also an Intake air temperature sensor. Typical trouble codes are P0234, P0235, P0236, P0237, P0238, P0240, P0241 and P0242. Symptoms of a faulty boost sensor include lack of power, poor acceleration and rough idle. This specific vehicle is an Audi S4 Boost / Charge Air Pressure Sensor.

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P012B - Charger inlet pressure rationality check
P012C - Charger inlet pressure short to ground
P012D - Charger inlet pressure shor to B+
P0106 (Vag code 16490) - Manifold Absolute Pressure / Baro Sensor Range/Performance
P0234 (VAG Code 16618) - Turbocharger / Supercharger Overboost Condition Rationality check high
P0235 (VAG Code 16619) - Boost pressure control
P0236 (VAG Code 16620) - Turbocharger / Supercharger Boost Sensor A Plausibiity Check
P0237 (VAG Code 16621) - Turbocharger / Supercharger Boost Sensor A Circuit Low
P0238 (VAG Code 16622) - Turbocharger / Supercharger Boost Sensor A Circuit High
P0240 (VAG Code 16624) - Turbocharger / Supercharger Boost Sensor Rationality Check
P0241 (VAG Code 16625) - Turbocharger / Supercharger Boost Sensor short to ground
P0242 (VAG Code 16626) - Turbocharger / Supercharger Boost Sensor short to B+
P2227 - Turbocharger / Supercharger Boost Sensor A Plausibility check

P012B - Pressure difference in cross check between boost pressure sensor 1 or 2; charger inlet pressure, ambient pessure sensor is greater than 7 kPa -OR- pressure difference in cross check between boost pressure sensor 1 or 2 and charger inlet pressure is greater than 12 - 27 kPa.

P012C - Signal voltage is less than .2v

P012D - Signal voltage is greater than 4.8v

P0106 - Boost pressure signal / altitude sensor is less than -210hPa or greater than 230hPa

P0224 - Difference in value boost pressure vs actual boost pressure, greater than 200 to 1275 hPa

P0235 - Boost pressure sensor signal vs target value is greater than 27-50 kPa, depending on altitude

P0236 - Pressure difference in cross check between boost pressure sensor 1 or 2; charger inlet pressure, ambient pressure is greater than 7 kPa -OR- pressure difference in cross check betwen boost pressure 1 or 2; charger inlet pressure is greater than 12-27 kPa -OR- pressure difference in cross check between pressure sensor 1 and 2 is greater than 12.51 kPa

P0237 - Signal voltage less than .2v

P0238 - Signal voltage is greater than 4.8v

P0240 - Pressure difference in cross check between boost pressure 1 or 2; intake manifold pressure ambient pressure greater than 7 kPa -OR- pressure difference in cross check between boost pressure sensor 1 or 2 ; intake manifold pressure greater than 12-27 kPa -OR- pressure difference in cross check between pressure sensor 1 and 2 is greater than 12.51 kPa

P2227 - Pressure difference in cross check between boost pressure sensor 1 or 2, intake manifold pressure, ambient pressure is greater than 7

Vehicle shown is an Audi S4 Charge Air Pressure Sensor G31 and Intake Air Temperature (IAT) Sensor G72. (Driver's side is Charge Air Pressure Sensor 2 G447 and Intake Air Temperature (IAT) Sensor G430.

Note:
Any attempt to repair automotive parts and/or systems carries risk of personal injury. Always adhere and follow safe practices when working on vehicles. Such as, safety glasses, jack stands, no loose clothing, etc. No guarantee or warranty is implied. Use the information in this video at your own risk. Carsntoys is a member of the Amazon Influencer Program.

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