EPC light comes on at 4,000 RPM

Dauntless

Guest
Hi all, this is my first post and I'm looking for any advice or suggestions anyone can give, It's a bit of a long story but I'll try to keep it short:

I have a 2004 Seat Ibiza 2.0 Sport Petrol (Engine code AZL)

I recently came back from holiday to find my battery completely dead (everything was off, even the clock and alarm system). I jump started it from another car and took it for a bit of a drive to try and get some life into the battery. (I realise now that this may have been a waste of time as the battery was probably at the end of its life).

The first thing I noticed was that the power steering wasn't working at all and the PAS light was on.
When I got to around 4,000 RPM I lost power and the engine sounds like it's struggling, the EPC light also comes at 4,000 RPM and turns off a few seconds after I keep below 4,000RPM.

I've now replaced the battery with one from another car, it's not brand new but at least the car now starts up ok. The power steering now works fine; in fact the steering is now a lot 'lighter' than it ever was before. I believe this is because it's electro-hydraulic power steering and the old battery was struggling to give enough power to the electric motor?

However the EPC problem is still the same even with the new battery, so I'm looking for a bit of advice on what to do next. I seem to have the exact same problem as this guy:

seatcupra.net/forums/showthread.php?t=358651

He said he changed the crank sensor and that appeared to fix the problem, so I'm thinking about buying this and fitting it myself:

onlineautomotive.co.uk/Products.aspx?ProductID=5749&VehicleID=38410

Just wanted to check with you all that I'm doing the right thing? I obviously don't want to keep buying and changing different parts if there's no need.

Does it make sense that the crank sensor has gone faulty the same time the battery died? The car wasn't standing for long, it was just over a week.

I'd really appreciate any response you guys can give.

Many thanks,
 

Dauntless

Guest
I decided to buy an OBD2 cable and check the fault with VAGCOM, this is what it found:

VCDS-Lite Version: Release 1.1
Tuesday, 06 November 2012, 15:27:41.


Chassis Type: 6K - Seat Ibiza/Cordoba
Scan: 01,02,03,08,15,17,25,45,56

-------------------------------------------------------------------------------
Address 01: Engine Labels: Redir Fail!
Controller: 06A 906 032 NP
Component: 2l/2V EU4 4856
Coding: 00001
Shop #: WSC 00000
VCID: 79856EE770D7

2 Faults Found:
16705 - Engine Speed Sensor (G28): Implausible Signal
P0321 - 35-10 - - Intermittent
18104 - Powertrain Data Bus: Implausible Message from Steering Column Controller
P1696 - 35-10 - - - Intermittent
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 6Q0-907-37x-ABS.LBL
Controller: 6Q0 907 379 H
Component: ABS/ASR 5.7 FRONT V30
Coding: 00188
Shop #: WSC 06403
VCID: 42F7C90B5D81
No fault code found.


I belive the 16705 - Engine Speed Sensor (G28): Implausible Signal is the cause of the EPC fault?

wiki.ross-tech.com/wiki/index.php/18104/P1696/005782

Seems to me like the sensor is only able to 'sense' the speed of the engine when it's going below 4,000RPM and when it's anything above that it sends a bad/wrong signal?

So am I correct in changing the Engine Speed Sensor first? and does anyone have the part number for the G28 sensor?

I think it's this:

onlineautomotive.co.uk/Products.aspx?ProductID=5749&VehicleID=38410

But not 100% sure and I'd like it if someone could confirm!

cheers
 
Last edited by a moderator:

Dauntless

Guest
For anyone else who has this problem:

The EPC problem got worse (light came on at lower revs, rough idle and started to cut out while driving, sometimes wouldn't start for a while)

I changed the engine speed sensor and the problem appears to have gone
Part number for my car (Ibiza 2.0 Sport): 06A906433L

I called up the dealer to confirm the part number before I ordered it.

The Dealers price was £117.95 inc VAT however I got one on ebay from a seller called stephenj65

myworld.ebay.co.uk/stephenj65?_trksid=p2047675.l2559

I paid £20 for the speed sensor and an engine temp sensor, they were very helpful and I'd definitely recommend using them again. Give them a call.
 
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