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I have a 99 Volvo s70. Mechanics have told me there are 2 codes that show up on the scanner to find what the problem is but no one seems to know what they mean....
They are:
p0236 & 238. Does anyone know what they mean and their solutions?
Thanks.
 

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P0236/ECM-170F = Atmospheric pressure sensor / boost pressure sensor range check. Faulty signal.

I believer the other is: P0238 Turbo boost sensor A Circ Hi Input
 

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I would have to agree with P0236, the exact part I belive is the "Barometric Pressure Sensor" I just replaced on my 98 S70 T5. I didnt write the code down but i think it was the same one. I ordered mine from IPDUSA.com & the code went away, verry easy install. The sensor is located right behind the passenger side light only need a 10 to replace.
 
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