Audi A4

since 1994 release

Repair and operation of the car

A4 Audi
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ System of an exhaust
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and channels of absorption
+ System of injection
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ System of ignition
+ Lighting
+ Alarm equipment
- Tools and devices
   Check of control tools and bulbs
   The combined device
   Indicator of amount of fuel
   Indicator of temperature of cooling liquid
   Auxiliary devices
   Control bulbs above in the combined device
   Control bulb of cooling liquid
   Control bulb of level of brake fluid
   Control bulb of pressure of oil
   Control bulb of indexes of turns
   Control bulbs in devices of a round form (and nearby)
   Control bulb of indexes of turn on the trailer
   Control bulb of ASR
   Control bulb of the lock of ignition
   Control bulb of headlights of a driving beam
   Control bulb of a safety cushion
   Control bulb of ABS
   Control bulb of the parking brake
   Control bulb of a battery charging
   System of autocontrol of the car
   Ignition lock
   Check of switches
   Alarm buzzer of lighting
   The warmed back glass
   Check of screen wipers and windscreen washers
   Engine of screen wipers
   The help at malfunctions
   The gulf of liquid for washing of glasses
   System of washing of headlights
   Adjustment of a mirror with the electric drive
   Central lock
   Window regulators with the electric drive
   Sliding/removable roof with the electric drive
   Radio receiver
   The antenna on back glass
+ Heating and ventilation
+ body Details
+ Salon
Search of malfunctions
Technical characteristics

Control bulb of pressure of oil

Control bulb of level of brake fluid

Oil pressure in the Audi A4 engine is controlled by the oil pressure sensor in combination with the electronic logic unit in the combined device. In this regard the signal is already given not on the basis of only pressure of oil, and in combination with data on temperature of cooling liquid and number of turns of the engine. Criteria for inclusion of an alarm bulb:

  • The engine does not work, the sensor of pressure of oil is closed.
  • Temperature of cooling liquid is above 60 °C, the number of turns of the engine exceeds 1500 rpm and the sensor of pressure of oil is open.
  • Temperature of cooling liquid is below 60 °C, the number of turns are higher than 300 rpm and the sensor of pressure of oil is open.
  • At engine turns higher than 5000 rpm the activated signal of pressure of oil is not switched off (irrespective of position of the switch of pressure of oil).
  • If during the operation of the engine on turns higher than 1500/mines sensor of pressure of oil remains open more than 0,5 with, this information remains in the computer. If this state arises three times in a row, the warning signal becomes more active and is not switched off even if the number of turns falls. From the following inclusion of ignition counting is started anew.

Oil pressure switch

In four - and six-cylinder engines different sensors of pressure of oil which isolated details for difference have different color are installed:

  • Black color at the oil pressure switch from 1,4 bars in four-cylinder engines.
  • White color at the oil pressure switch from 1,8 bars in six-cylinder engines.


  • If the alarm bulb (sometimes with a sound signal) burns at the working engine, you have to stop at once!
  • At once switch off the engine, check oil level. If everything is all right:
  • Tow off the car to prevent more serious damages because of a lack of greasing.
  • As the following measure check oil pressure.
  • If oil pressure as it should be, you can change the oil pressure sensor (in a workshop).
  • If, despite it, the lamp does not die away, the reason in the device.

Replacement of the sensor of pressure of oil

Wires to the sensor of pressure of oil and to the oil temperature sensor in the six-cylinder engine are connected in this shtekerny socket (shooter) behind on the left head of the block of cylinders.

At the left near a belt pulley of the crankshaft in the six-cylinder engine there is a sensor (1) indicator of temperature of oil and the sensor of pressure of oil (2).


  1. Buy the necessary sensor of pressure of oil with black or white isolation and to it a new sealing ring.
  2. Tighten the oil pressure sensor only upon 25 Nanometers.