Error Code 575: Intake Manifold Pressure Problem

hello everyone,

'I've been experiencing a problem with my Golf TDI (1.9L, 66kW) for some time now: it only accelerates to 120 km/h in fourth gear and 140 km/h in fifth gear. The error memory shows an error code 575 (intake manifold pressure). At the VW workshop, they first replaced the brake light switch (without any effect). Then, they suggested that my fuel injection pump was broken. Since the car is 8 years old and has 260,000 km on it, I'm not willing to pay €1500 for a new fuel injection pump. After reading various things in this forum, it seems like this error might be related to the mass airflow sensor or the intake manifold pressure sensor.'

Can someone tell me if this could be related to the fuel injection pump, or how it's connected to this error message?

After the car was returned from the workshop, it almost wouldn't start and was smoking like crazy.

I get the impression that they have no idea where to look.

I am grateful for any advice.

best regards, tom

Hello,

If the workshop replaced the brake monitoring switch due to this issue, I would request a refund for my ELD (Electronic Logging Device).
Is this defective, or is it the cause of the emergency mode? If so, another error will be stored (e.g., a faulty brake monitoring switch or an implausible signal from the brake monitoring switch).

First, check the N75 valve for the turbocharger pressure regulation and the vacuum hoses for leaks.

If it's currently producing a lot of smoke and is very difficult to start, it might be that the workshop incorrectly adjusted the fuel injection pump.

Hi,

You might be able to check the fuel injection pump yourself, which is likely misadjusted. Take a look at the technical article on how to adjust the pump.

@Michael II: Vacuum hoses in the turbocharger control of a 8-year-old TDI .
As far as I know, only wastegate turbos were available back then. Therefore, the (pressure) hoses around the boost pressure solenoid valve and, of course, the pressure hose to the engine control unit should be checked.

Thank you for your tips.

I made another attempt yesterday.

I disconnected the mass airflow sensor connector and drove anyway.
- absolutely no more performance.

Then I unplugged the connector from the part that I believe is the intake manifold pressure sensor (it's located next to the battery in the pipe coming from the intercooler).

- no difference

What does this sensor do, or what are the consequences if it is defective?

tom

Hi.

Quote:

Then I unplugged the connector from the part that I believe is the intake manifold pressure sensor (located next to the battery in the pipe coming from the intercooler). - no difference. What does this sensor do, or what are the consequences if it is defective?

If the part has only two wires, it is the intake air temperature sensor. According to a description of the TDI principle, it serves for fine adjustment of the boost pressure and for controlling the glow plug auxiliary heater.

A defect usually doesn't show any obvious symptoms, except for an error message. In winter, the glow plug heating may occasionally stop working.

Thank you, Ulf.

Can you tell me where the intake manifold pressure sensor is located, and if it exists, what its function is?

Hi.

In older TDI engines (usually), the sensor is located in the engine control unit and connected to the intake manifold via a thin hose.

What he does should be clear: he measures the boost pressure in order to regulate it to the target value, etc.

It's 99% likely that the N75 wastegate control valve or hose is leaking. This part isn't expensive (less than €30), so it might be worth just replacing it as a precaution, especially since it wears out over time (mine makes a louder clicking sound than the engine).