JETTA 5 8V 2LT MANIFOLD / BAROMETRIC PRESSURE SENSOR P0108 PROBLEM

A Jetta 5 8v 2lt came in for engine noise, what I found was that one Hydraulic lifter top was missing – the lifter is part of the follower, it is one unit, see the photo below. It is an easy job we replace the lifters and camshaft and it is a good practice to replace the oil pump also. This car has 410000 km on the clock and to replace the oil pump will be good thing. But after we have done this the engine does not want to idle, the engine cut out and does not want to idle at all. I plug in the VAG diagnose and the following code was logged:

1 Fault Found:
16492 – Manifold / Barometric Pressure Sensor (G71) / (F96)
P0108 – 001 – Signal too High – Intermittent

I have cleared the code but it comes back immediately, so that tells me there is a permanent fault. My next step was to unplug the sensor to check the wiring and voltage. To check the voltage at the wiring side do the following:

1.Pin 3 the voltage should be closed to 5v

2.Pin 1 voltage 0 -.02v

3.Pin2 voltage should be .5v

4.Pin Check this wire to the ECU for continuity

If all these checks have been pass,my next step would be to use a scope to check the sensor operation.

Actually before I have done these checked I notice that there is something wrong with the wiring, one wire is completely broken of and the other 3 looks like something is eating the wires. See the image below.

Well after reconnect the wire and secure the other wires the fault is fixed.

Wiring eating by insects

 

 

 

Jetta 5 Hydrualic lifter

Updated: 15th Sep 2019 — 8:09 pm

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