Hello, desperate new member here, 

 

a couple of months back whilst driving I would notice my car 2015tt tdi ultra , hiccup , just a very slight jump, could be anytime at any speed, over a little time this issue was getting worse, could be 4-5 times in a row, I took the car to a garage who checked which codes came up, of which was fuel rail, speed sensor, camshaft, (sorry I don’t have the codes to hand), the garage wiped the codes and I drove off waiting for them to reappear. The issue at this point is now getting worse, the engine warning light came on, hillstart, ttps, esp etc.

i returned to the garage and they tried a new camshaft and crankshaft sensors, these had come up on the codes, again, this didn’t sort the issue.

i took the car to an Audi specialist and after much of the same they have changed a in tank fuel pressure in the tank under the rear seats, checked all the wiring in the engine for any wire issues, still the problem persists. The cat is getting gradually worse, and as said above I don’t have the specific codes but he did say it’s co stay my bringing up spied sensor and low pressure. He’s apparently done maf readings which came up normal.

does anyone have any ideas please what thos could be, I’ve paid out a small fortune recently and not seeming to get anywhere.

thank you 

Welcome Jason and sorry to read of your problem.

With note to your thread title of ‘Low pressure’, what pressure have you been told is low, so members can better relate to your issue? 
Regards,

Gareth.

Thank you.

 

I believe  it was low fuel pressure, changing the fuel pressure  pump (I’m so rubbish with cars as you can possibly tell) under the back seat did nothing, the guy at the garage said he thinks it now could be the ecu, they checked for any visual damage to it and nothing, I spoke to someone who deals with ecu’s and remapping and he said he doubts it is that 

Edited May 29, 20251 yr by Jenson