Question about 2002 Audi A4

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P1857 When the gear is selected, it trips off

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P1857 is usually a bad MAF (mass air flow) sensor. You can find a bit more detail here but that code is pretty consistent.

Posted on Aug 05, 2013

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Posted on Jan 02, 2017

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My mph, gas, and temp gauges are not working


That's why you don't let you husband work on your car ! Unless he does it for a living .. For MPH there is a VSS - vehicle speed sensor , for the gas there is a sending unit in the fuel tank, for the temp. gauge there is a temp. sensor located in coolant stream on the engine .You more then likely need to have you instrument cluster repaired . GM had a problem with step motors inside the instrument cluster . A step motor is what controls the individual gauge. The sensors are all inputs to the PCM - powertrain control module (engine computer ) .
Engine Coolant Temperature Gage
The IPC displays the engine coolant temperature as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the engine coolant temperature. The engine coolant temperature gage defaults to C or below if:
?€¢
The PCM detects a malfunction in the engine coolant temperature sensor circuit.


?€¢
The IPC detects a loss of class 2 communications with the PCM.

Fuel Gage
The IPC displays the fuel level as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the fuel level percent. The fuel gage defaults to empty if:
?€¢
The PCM detects a malfunction in the fuel level sensor circuit.


?€¢
The IPC detects a loss of class 2 communications with the PCM.

When the fuel level is less than 14% (84ohms), the low fuel indicator illuminates.
Odometer
The IPC contains a season odometer and a trip odometer. Momentarily press the trip select/reset switch in order to toggle between the season odometer and the trip odometer. Press the trip select/reset switch for greater than 1.5 seconds, while the trip odometer is displayed, in order to reset the trip odometer. The IPC displays the vehicle mileage and trip mileage as determined by the IPC. The IPC calculates the mileage based on the vehicle speed information from the PCM. The odometer will display 'error' if an internal IPC memory failure is detected.
PRNDL Display
The IPC displays the selected gear position as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the gear position. The PRNDL display shall flash all gear positions if:
?€¢
The PCM detects a malfunction in the transmission range switch circuit.


?€¢
The IPC detects a loss of class 2 communications with the PCM.

Speedometer
The IPC displays the vehicle speed based on the information from the PCM. The PCM converts the data from the vehicle speed sensor to a 4000 pulses per mile signal. The IPC uses the vehicle speed signal circuit from the PCM in order to calculate the vehicle speed. The speedometer defaults to 0 mph (0 kph) if a malfunction in the vehicle speed sensor circuit exists.
Tachometer
The IPC displays the engine speed as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the engine speed. The tachometer will default to 0 rpm if:
?€¢
The PCM detects a malfunction in the engine speed sensor circuit.


?€¢
The IPC detects a loss of class 2 communications with the PCM.

May 22, 2016 | 2002 Buick Century

1 Answer

99 dodge durango will not shift into 3rd gear


you locked it into a specific ratio when you went down hill in 2 nd
it will not upshift until you select drive again

Jan 13, 2018 | 1999 Dodge Durango

1 Answer

2002 honda cr v select/reset button broken


replace it, its bad.
( as speedo shop can fix it at 2 times new. ?)

Jan 21, 2014 | 2002 Honda CR-V

1 Answer

2003 MR2 - 6 speed having weird error codes. (p0911) I'm a 6 speed, 64,000 miles once hot (or driven extended trips) the gears feel like they are "slipping" then the car shuts off. if I just drive it...


code p 0911 refers to transmission gate select actuator---circuit /range performance====causes --wiring---poor connections---transmission gate select actuator---ECM ---TCM
Take it in to an auto transmission specialist shop and have the TCM and the actuator tested
check for wiring failure or dirty terminal pins in connections

Feb 20, 2018 | 1989 Toyota MR2

1 Answer

VW jetta 99 2.0 L Still cutting off after replacing gas pump, gas filter and Sensor Crank (PC502T). Seems better but still shutting off... After erasing previous codes now getting codes PO 725, P1850...


Hi!..I had the same problem with my wife's car. 99 vw jetta 2.0l. I had the crankshaft sensor replaced. The car runs fine now and better! Good Luck!!!

Feb 12, 2013 | Cars & Trucks

1 Answer

Tranmission wont shift


Gears inside welded together, or stuck in limp home mode. Is it stuck in a gear other than 1st or reverse? Limp home mode will select one gear, usually 2nd, when computer senses a problem with valve body pressure, or excessive heat. Either way it sounds like a trip to the ****** shop.

Oct 06, 2012 | 1999 Plymouth Voyager

1 Answer

Prius start up beeps


  • Power on the car to IG-ON or READY. IG-ON will do for this purpose.
  • Using the Trip/ODO button, set the Trip/ODO display to ODO - not Trip A or Trip B
  • Power off the car.
  • Now power the car to READY (brake on). This is required so that step 6 works correctly.
  • Immediately, within 6 seconds of powering on, press and hold the Trip/ODO button for 20 seconds or more. Do not release, just hold it for 20 seconds.
  • Then WHILE STILL HOLDING ODO button, shift the "gear" selector from Park to R, then press the Park button. Now release the Trip/ODO button.
  • If the last step was successful, b on or b off should be displayed in the location where the Trip Odometer or Odometer is normally displayed. b on is beep on, and b off is beep off.
  • Press the Trip/ODO button to toggle the mode to the one you want.
  • Now power the car off to exit the toggle mode.
  • Power the car on to READY and confirm the reverse beep status by shifting to R. The beep should not be audible if b off was selected, and should be audible if b on was selected.
  • Jun 06, 2012 | 2004 Toyota Prius

    1 Answer

    I have a Disco 200 V8 model. Came back from a trip and next morning, wont start. By passed alarm system with key code. No luck. Checked all wires. Launch 410 diagnostic indicate that permanent power loss...


    Have a 99 disco....I had to take the gear selection control box, underneath the center consol. There isa switch that came loose that interfaces with the brake and ignition to start the car. Also there is a selenoid in the box that could go bad. also could be a bad brake switch. Try pushing the gear shift foward in park while cranking, if it cranks then the gear selection switch is bad. The problem is between the key switch and the starter....trace it down. Also you can buy cheap a LR repair disc.

    Mar 15, 2011 | 2000 Land Rover Discovery

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