fault codes reading

[02v70t5]

Hi i've had my codes read at snows poole this morning and they produced a whole list of codes mostly all bumph, but there are 4 that they have said need looking at
ccm-0021 air quality sensor internal fault
psm-0038 incorrect software?
uem-0004 siren communication fault (needs replacing and not worried)
ecm-6814 turbo control signal too high

Could anyone give some advice on where to start looking for a solution on how to fix these faults?
It had also come up with a maf code ecm-1300 sensor flow too high but the 4 above are the only codes that came back after erasing the codes.

The car bogs on wot at about 3500 rpm and lower if you've been sat in traffic

[wynnj]

The ccm 0021 relates to a sensor that detects bad air outside the car and shuts the air flow intake off temporarily. I've got the same on my V70 and it's the second car I've had it on. Doesn't affect the normal operation of the climate control but is quite a lot of work to replace as the sensor is somewhere under the scuttle in the vicinity of the wiper motor and requires quite a lot of dismantling. Lots of chargeable hours for a garage!!

UEM 0004 went away when I changed the siren.

D
Can't help with the others

[sneakypenguin]

PSM-0038 I think relates to your electric/heated seats. Do they operate as normal or are they too hot/cold?

mick

[02v70t5]

When i brought the car the fella said it had no heated seats and i haven't found a switch for them.

[reggit]

PSM is the power seat module - this refers to electrically adjustable seats and not seat heaters.

Its likely that your running issues are caused by the ecm error, the other 3 seem pretty insignificant.

This is what Vida has to say on the ECM error:

Diagnostic trouble code (DTC) information

Condition
Diagnostic trouble code (DTC) ECM-6814 is stored if the relationship between the measured pressure (from the boost pressure sensor) and the calculated boost pressure is greater than a certain value. The fault is diagnosed by the control module when turbocharger (TC) control is active.

Substitute value
Reduced boost pressure.
Possible source
Air leakage downstream of the turbocharger (TC) (between the turbocharger (TC) and the throttle unit)
The boost pressure sensor has come loose (measures the atmospheric pressure)
Defective boost pressure sensor.

Fault symptom[s]
Poor performance.

[02v70t5]

Thanks all well i've checked and double checked the pipework, cleaned and checked the intercooler so only leaves the sensor (in theory) but i'd like to get hold of a worker to test the theory before i fork out a load of money on something i didn't need, would anyone have one cheep.