2008 skoda octavia mk2, 1.9BLS engine

Hi there, I have faced these errors for a couple of months now:

When it's hot, the car gets an engine light, with the glow plug light blinking and ESP/TCR light on. The car does not go past 3k rpm and also shakes a lot at starts and stops.

i have 2 vcds auto scans that show errors related to the engine and ABS module, I can't seem to find any help..

scan 1:

Address 01: Engine Labels: 03G-906-021-BLS.clb

Part No SW: 03G 906 021 TG HW: 03G 906 021 AB

Component: R4 1,9l EDC G000SG 2051

Revision: --H08--- Serial number: SKX7Z0H632F0IL

Coding: 0000071

Shop #: WSC 06325 000 00000

VCID: 77FD5EDB06CD4D23F1-8022

VINID: 91D4988C606A208082009202106D8E37D5

1 Fault Found:

001602 - Sensor Reference Voltage A

P0642 - 000 - Voltage too Low - MIL ON

Freeze Frame:

Fault Status: 11100000

Fault Priority: 1

Fault Frequency: 1

Reset counter: 255

Time Indication: 0

Freeze Frame:

RPM: 0 /min

Speed: 0.0 km/h

Bin. Bits: 00100000

Bin. Bits: 00000000

Bin. Bits: 00100000

Bin. Bits: 00100000

Bin. Bits: 00100000

Readiness: 0 0 0 0 X

\-------------------------------------------------------------------------------

Address 03: ABS Brakes (-----) Labels:. 1K0-907-379-60EC1F.clb

Part No SW: 1K0 907 379 CD HW: 1K0 907 379 AD

Component: ESP MK60EC1 H35 0120

Revision: 00H35001

Coding: 113B201C09220003881304E6901D00416800

Shop #: WSC 22150 002 1048576

VCID: 76E353DFC1C7342BEA-8022

1 Fault Found:

01314 - Engine Control Module

013 - Check DTC Memory

Freeze Frame:

Fault Status: 01101101

Fault Priority: 2

Fault Frequency: 1

Reset counter: 125

Mileage: 315424 km

Time Indication: 0

Freeze Frame:

Count: 2

Count: 2

Count: 12544

Count: 8196

Count: 44800

Count: 768

Count: 0

Count: 0

aaand scan 2:

Address 01: Engine Labels: 03G-906-021-BLS.clb

Part No SW: 03G 906 021 TG HW: 03G 906 021 AB

Component: R4 1,9l EDC G000SG 2051

Revision: --H08--- Serial number: SKX7Z0H632F0IL

Coding: 0000071

Shop #: WSC 06325 000 00000

VCID: 77FD5EDB06CD4D23F1-8022

VINID: 91D4988C606A208082009202106D8E37D5

1 Fault Found:

001602 - Sensor Reference Voltage A

P0642 - 000 - Voltage too Low - Intermittent

Freeze Frame:

Fault Status: 00100000

Fault Priority: 1

Fault Frequency: 1

Reset counter: 255

Mileage: 315432 km

Time Indication: 0

Date: 2000.00.00

Time: 16:33:25

Freeze Frame:

RPM: 0 /min

Speed: 0.0 km/h

Bin. Bits: 00100000

Bin. Bits: 00000000

Bin. Bits: 00100000

Bin. Bits: 00100000

Bin. Bits: 00000000

Readiness: 0 0 0 0 X

\-------------------------------------------------------------------------------

Address 03: ABS Brakes (-----) Labels:. 1K0-907-379-60EC1F.clb

Part No SW: 1K0 907 379 CD HW: 1K0 907 379 AD

Component: ESP MK60EC1 H35 0120

Revision: 00H35001

Coding: 113B201C09220003881304E6901D00416800

Shop #: WSC 22150 002 1048576

VCID: 76E353DFC1C7342BEA-8022

1 Fault Found:

01314 - Engine Control Module

013 - Check DTC Memory - Intermittent

Freeze Frame:

Fault Status: 00101101

Fault Priority: 2

Fault Frequency: 1

Reset counter: 165

Mileage: 315432 km

Time Indication: 0

Freeze Frame:

Count: 3

Count: 2

Count: 12544

Count: 8196

Count: 45312

Count: 0

Count: 0

Count: 0

Not sure but in two cases voltage is too low. Whats the condition of your battery? A failing one or low voltage can cause random probems.

Alasdair

12 hours ago, Alasdair1 said:

Not sure but in two cases voltage is too low. Whats the condition of your battery? A failing one or low voltage can cause random probems.

Alasdair

the battery has been replaced, when on the multimeter shows 14 ish volts, so i don't think it's the problem

If it does it when hot it may be a bad earth or coroded connector. As it gets hot things expand and can cause bad connections. Check for damaged wiring as well. Might be worth checking the strip fuses in front of battery as well. They are prone to cracking but almost impossible to see. As it heats up the crack opens and breaks circuit.

Have had this a few times in my Octavia and my sons Fabia. In my case it was ABS fault.

Sounds as though its going into limp mode.

Alasdair

Soo, after a few tests:

The error always disappears when I unplug the MAF sensor, BUT, the sensor is good as far as I am concerned, I even bought another and it's the same thing. as for the harness, it had a tiny 1 mm spot with no isolation on one wire; the others are fine

It seems that I won't get a good sleep yet.

Not sure if it will work but might be worth changing ECU relay/fuse. If its failing it would explain why it happens when hot. Think its in the unit near battery but not exactly sure which one it is.

Alasdair