WOW! My B5 is act'in up!...well after a long day of drving down the coast of california(PCH*orange county), I went home to go change my oil...I jack up the car, change the fluid and filter, then lowered it back to the ground. The car start right up, but then it started idling rough and and once i step on the gas, it would go all the way up to 3000rpm and drop all the way to 400rpm by itself...what is causing this? the motor is running rough and it dies after attempting to rev it over 3000rpm a couple of time...PLEASE HELP! i search and search but no answers for me....THANKS

CAR: 99.5 Audi A4 1.8T Quattro Tiptronic with 116k miles

 

I just use a obd2 reader and this is the code that pop up...can you tell me what to check or replace? Because i dont know what this means... P1545 Manufacturer Controlled vehilce speed, Idle control and Auxiliary input.

THANKS FOR LOOKING/HELPING!

 

P1545 Throttle Pos.Contr Malfunction

maybe your TPS

 

How can I fix it? Pics or where is it located?

 

perhaps a throttle body allignment/ calibration or could need a new throttle position sensor.... i really dont know for sure but those are probably pretty good guesses

 

First, clear the codes and try a throttle body adaptation. Turn the car to the on position without touching the gas or using the starter motor. Leave it there for 20 minutes. Turn the car off and then try to restart and see if that solves the problem.

Is your car DBW or does it have a throttle cable? What engine code do you have and I can help provide some further info

 

Driving fast are we. The first code is set when the vehicle hits the speed limiter. Check for boost/vacuum leaks. Also perform the above idle calibration.

 

I just remember that i really screwed up. Yesterday, right before I had all of these problems...I had the ignition on the "ON" position with the motor off...when it was on the "ON" position I accidently disconnected the battery with it on...What did I just do? Did I just f**k up something? Because right after then it started actin up. Please tell me! How can i fix it? Does the TBA help?

 

did you read that code right??? P1545 doesn't exist on my database, but P1505 does which means the closed throttle position ( CTP ) switch is not closing possible causes are throttle cable/valve, wiring open circuit/short to positive, CTP switch adjustment/ defective, ECM

 

Yes i read the code right...I'm 100% postive the code is P1545 Manufacturer Controlled vehilce speed, Idle control and Auxiliary input...The car is sputtering and the rpms is jumping, while it idling around 300-400 and sometime 150rpm right before it dies....need serious help...Again this is what happened:

"I had the ignition on the "ON" position with the motor off...when it was on the "ON" position I accidently disconnected the battery with it on."

I know i possibly screwed up something...tell me what!