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post #1 of 3 (permalink) Old 11-19-2009 Thread Starter
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Join Date: Nov 2009
Location: Harrisburg PA
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Wastegate sensor malfunction

I just found this forum and am signing on as a newbie. Info search is due to a problems I can't solve with my 1998 V70XC. This may have been hashed over many times, and if so I apologize in advance.

When I get on the gas pedal the check engine light comes on. The OBD code is PO243 which shows as "wastegate sensor A malfunction". I replaced the control valve and all the associated rubber tubing, but still get the light when I get on the gas. Everything seems to be working OK other that the light coming on.

Any ideas?
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post #2 of 3 (permalink) Old 11-20-2009
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Welcome from Atlanta! If you want me to change your user name just send me or user Admin a private message as to what you would like it to say.

The P0243 is 'Turbo / Supercharger Wastegate Solenoid A'. This would result in loss in performance. The turbo wastegate is set-up in such a way that it nominally runs a very low boost pressure. The Wastegate solenoid bleeds the manifold pressure signal back to the airbox to increase the boost pressure. If the EMS sensed a wastegate solenoid fault it would de-activate the solenoid which would give you a sudden drop in boost pressure.

The wastegate solenoid is a small valve about 1" cube and has 3 small ( 4-5mm ) pipes to it. It is located near the airbox, if not actually attached to the side of it.
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post #3 of 3 (permalink) Old 11-21-2009 Thread Starter
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Wastegate sensor malfunction

That is the valve I replaced along with the associated hoses. It's a small black cube with three small hoses and an electrical connector. And as I said, everything seems to be working OK except for the light coming on when I am hard on the gas. I does seem to have more kick than it did before I replaced the valve.

Someone offered the opinion that maybe the computer needs to calibrate the signal from the new valve and I should stay off the turbo for a few days to let that happen. Does that make any sense? I have never had a car with a turbo before so I not sure what to expect.
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