Hello everyone. I am a new member but have been reading posts on this site for some years now and found them very helpful in keeping my 2005 Octavia Tdi on the road. Lately though it goes into limp mode and will not respond to the accelerator for a while and the engine light comes on. Then after a while she begins to run perfect again and it could be a few days before she does it again. I checked the diagnostics and the following codes are coming up. 17911 and 16621. I also checked the hoses going to the turbo and did not find any leak. I cleaned the turbo boost sensor (MAP) and I checked the continuity of the wires from this sensor and also from the alternator and their sockets but all seems good. Do any of the good folk here have any ideas?

Regards; John.

Hello mate.

It sounds like it could be sticky turbo vanes which can cause the symptoms you describe. Do a search for sticky turbo vanes and you may find some answers. In the meantime have a look at this.

Hope it helps.

http://www.briskoda.net/forums/topic/329509-skoda-octavia-2009-19tdi-acceleration-fault/?hl=%2Bsticking+%2Bturbo+%2Bvanes#entry3970243

Sounds just like mine was doing in the summer.

 

easy as there is a huge amount of help here and other VAG forums.

 

dump the EGR and its cooler, Innotec Turbo clean kit, problem solved, awkward but not technically challenging and can easily be done for lesst than £150 and a few hours over a weekend, + removal of the EGR from the computer System.

 I checked the diagnostics and the following codes are coming up. 17911 and 16621. I also checked the hoses going to the turbo and did not find any leak. I cleaned the turbo boost sensor (MAP) and I checked the continuity of the wires from this sensor and also from the alternator and their sockets but all seems good. Do any of the good folk here have any ideas?

Regards; John.

Hi John, just wanted to tell you that MAP sensors can't be cleaned,you must replace defective sensor. But fault about MAP sensor can appear because of wrong 'environment' readings. First of all 'live data' reading,check environment in manifold. 

 

17911/P1503 - Load signal from Alternator Term. DF: Range/Performance / Implausible Signal

Possible Causes

• Alternator faulty
• Voltage Regulator faulty
• Wiring and/or connections faulty

Possible Solutions

• Check / Replace Alternator
• Check / Replace Voltage Regulator
• Check wiring and connections
• Check the fuse box that is in the battery tray, it might be burnt, the fuse or the complete plastic box (pretty common failure on Sharan because it carries so much electrical load). If so, change the complete fuse box, it is not too expensive fix if this is the cause.

 

16621/P0237/000567 - Manifold Pressure / Boost Sensor (G31): Signal too Low Possible Symptoms

• Malfunction Indicator Lamp (MIL) active

Possible Causes

• Manifold Pressure / Boost Sensor (G31) Power Supply faulty
• Manifold Pressure / Boost Sensor (G31) faulty

Possible Solutions

• Check Manifold Pressure / Boost Sensor (G31) Power Supply
• Check Manifold Pressure / Boost Sensor (G31)

Thanks guys. I pulled the fuses beside the battery and sprayed some contact cleaner around them and into their sockets and it appears the car is going perfect since! Could bad contact at the fuses cause this problem?

Regards;

John.

Thanks guys. I pulled the fuses beside the battery and sprayed some contact cleaner around them and into their sockets and it appears the car is going perfect since! Could bad contact at the fuses cause this problem?

Regards;

John.

Well it appears I spoke too soon! Today the car started doing it again. Seemingly no power from the turbo and the codes coming up are 18000 ( altitude sensor/ boost perssure sensor), 16621 (manifold boost pressure sensor, signal too low) and 17911 (load signal from alternator). The hoses from the intercooler to turbo is very hard when engine is revved. Is this a sign that the turbo is good? I replaced the MAP sensor with a second-hand unit but makes no difference. How do I check for power to the map sensor? Should there be a live wire going to it? Any answers would be appriciated. Thanks; John.

How old is your battery? If you have battery charger just give a good charge during night!
Can you make the alternator output test? See readings with all consumers ON. Must be over 13.7V otherwise your battery can't be charged properly especially at short trips. Battery is one of the reasons why faults are back.