2011 S60- Intermittent limp mode

lastyboy · Jul 12th, 2018, 16:38

Hi all own a 2011 S60 Twin turbo D5.
For the past 3 months I have an intermittent fault.

Under boost- normally higher in the rev range the car goes into limp mode.

Only fault code is p029900 - Turbo underboost.

The car drive for 10 miles and be fine all the way too work. Other times it is awful - almost continually flat.

I am actually in the trade. Smoke tested the vehicle, cannot see any vac leaks at all. Put some turbo cleaner through the system and it improved it for a week and then got worse.

Any ideas?
Jim

donegaljj · Jul 15th, 2018, 15:01

Could be exhaust sensor there is 2 of the just after the manifold screw them out if covered in soot replace do the one closest to engine first the cost round £60 each

volvo for ever · Jul 15th, 2018, 17:29

t-map sensor

Jul 12th, 2018, 16:38	#1
lastyboy New Member Last Online: Oct 16th, 2019 11:06 Join Date: May 2007 Location: NORWICH	2011 S60- Intermittent limp mode Hi all own a 2011 S60 Twin turbo D5. For the past 3 months I have an intermittent fault. Under boost- normally higher in the rev range the car goes into limp mode. Only fault code is p029900 - Turbo underboost. The car drive for 10 miles and be fine all the way too work. Other times it is awful - almost continually flat. I am actually in the trade. Smoke tested the vehicle, cannot see any vac leaks at all. Put some turbo cleaner through the system and it improved it for a week and then got worse. Any ideas? Jim

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Jul 15th, 2018, 15:01	#2
donegaljj New Member Last Online: Jul 15th, 2018 15:01 Join Date: Aug 2013 Location: Ballybay	Could be exhaust sensor there is 2 of the just after the manifold screw them out if covered in soot replace do the one closest to engine first the cost round £60 each

Jul 15th, 2018, 17:29	#3
volvo for ever Premier Member Last Online: Feb 4th, 2023 15:10 Join Date: Apr 2015 Location: uk	t-map sensor

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