HI

I have a Superb MkII on 09 plate which has gone into limp mode with engine warning light.

 

After attaching ODB2 adapter & using Torque app the code P0238 PowerTrain (Turbo Charger/boost sensor "A" circuit high) 

 

After looking at old topics I am still unsure where the boost sensor is located, I can locate the Turbo Boost  Pressure Solenoid but unable to locate the 

Turbo Charger/Boost Sensor!

 

I have checked various diagrams but they point to various areas( No 6 on diagram!)  & a youtube video points to the Solenoid valve has the boost sensor! 

 

Pictures are a Boost Pressure sensor (top) and a Boost Pressure Solenoid (Bottom).

 

 

Any help would be grateful as if it's an easy fix I would rather DIY.

Edited 10 June, 20197 yr by Sean Nangle

For my engine access is from underneath once engine undertray is removed.

Also look out for hidden broken wires under the pvc near the sensor plug, watch measured value blocks while moving the sensor loom to save wasting money on a sensor. The sensors do fail though. 

As that code suggests signal too high, with ignition on engine off, see if the boost measured is close to the ambient pressure of the reading for the engine ecu, if it’s measuring boost way above what the sensor in the ecu measures, you know good chance G31 is knackered.

Hi

 

 

A strange thing happened today, after having this sluggish car for over a week trying to figure out which part is faulty I drove it today & the fault had gone!

 

No message, no limp mode, no code through DashCommand!

 

I've done about 5 miles hopefully without incident, I'll have to drive over the next few days & open her up to see what happens! 

 

That could indicate a broken wire being held together by the pvc which is making contact now.

When the sensors fail, they usually stay failed from the ones I’ve changed.

MVB would show a boost value with the engine off which obviously is not possible and will go into limp mode when trying to drive it as any additional boost measured will put the perceived boost above the mapped value.

The sensor fault has re-appeared, had to drive to Leeds from Nottingham & it was a pain with turbo not kicking in!

 

I have removed undertray to find the sensor to no avail, I've booked into Skoda on Thursday 20th for check wiring & fitting of new sensor it's £130 for the hour (ouch!!).

 

I contacted other local garages but they didn't seem to want to do anything other than charge silly price to do a diagnostics which through DashCommand I've already done! 

 

Hopefully, they will find the issue either wiring or sensor, I've requested they fit the new sensor in any case as this won't hurt, 

Has the sensor been diagnosed as faulty? That code looks more like a wiring issue to me.

Hi

 I was unable to locate the sensor once under the car so can't confirm if it's the sensor or the wiring, I have requested that Skoda dealer check both wiring & sensor.