Turbo Pressure Sensor

lavist · Post by **lavist** » 23 May 2018, 15:24

I have a 2001 S80 T6 with 168000 miles on it and this morning, for the first time, it was hesitating out of the driveway. I'm getting trouble codes P0236 and P0237 indicating Turbo Pressure Sensors. Seems odd that both pressure sensors would go bad at the exact same time. Had to pull of on the side of the freeway when I essentially lost all power. Reminded me of the "Limp Home" fault I was getting back in 2002 when the dealership advised the car had been recalled for that condition. I shut off the car, restarted it and was able to get home. About a mile from the house the display came up with "Service Engine URGENT". Any ideas on what service I need to perform? How do I replace the twin turbo sensors?

Post by **FLXC90** » 24 May 2018, 03:18

You were "able to get home", but was it driving normally? Or still hesitating. Get it scanned using VIDA/DICE not just generic scanner if not what you used. As you state, both sensors at once sounds odd. Check your charge air pipes, intercooler etc. Also, check the vacuum/boost reference hoses for leaks. How clean is your air filter?

lavist · Post by **lavist** » 24 May 2018, 10:39

How do I check the vacuum/boost reference hoses? Not sure where they are. Air filter replaced at last oil change but will change it again.

Post by **SuperHerman** » 24 May 2018, 23:56

I just worked through the turbos on my 2004 XC90 T6 which has a pretty similar set up. It has only one turbo boost sensor. If I recall correctly it is right by the air box. Check the hoses and pay particular attention to the corner of Bank 2 behind the head (driver corner of engine). On my car one of the hoses from the turbo boost sensor was routed there - hit a hard plastic T connector and branched off (effectively coupling the Bank 1 and Bank 2 turbos to the single turbo boost sensor). One of my rubber lines was completely destroyed from 14 years of service.

Best approach would be to find your turbo boost sensor and follow all the lines to their end points (if I recall there are three - but one of them branches off to the two turbos). All my lines looked fine but the one that went to the Bank 2 turbo. These lines are in an area that gets pretty hot and it is understandable they fail after 17 years of service.

You can buy Volvo lines or bring a piece to an auto store, tell them the hose purpose and acquire the amount needed. I recommend getting either the right color electrical tape or another means (I used my daughter's nail polish) to properly color code your hoses (red, blue, yellow and/or green - don't recall which three) if you replace them all. Color coding will make future service much easier.

Post by **SuperHerman** » 24 May 2018, 23:59

Forgot to mention - the Volvo replacement hoses are the correct length and are color coded. Makes repair rather easy. When I checked they had a "kit" with all the hoses needed. As I needed only 4 inches - I found another solution in my parts bin.

lavist · Post by **lavist** » 25 May 2018, 09:54

Thank you so much for the great and complete reply SuperHerman. I’ll check the hoses for vacuum leak and replace as necessary.

lavist · Post by **lavist** » 25 May 2018, 13:43

Thanks FLXC90. It wasn't quite driving normally, there was still some jumpiness as the Turbo would get a surge, then go off so yes, still hesitating. I will get it scanned using VIDA/DICE as suggested. I'll start with checking the vacuum hoses for leaks since that's the easiest fix then move on to intake, intercooler and if necessary, replace the sensor itself. I appreciate all the assistance, I had no clue where to start.

Post by **SuperHerman** » 25 May 2018, 13:49

Keep us posted. If it ends up being a hose, take some pictures before removal and after, so others can benefit from your toils.

lavist · Post by **lavist** » 08 Jun 2018, 14:29

As it turns out, there is a Turbo Pressure Sensor that Advanced Auto website said fit my vehicle but it did not. Incorrect Bosch P/N is 0261230090. What it turned out to actually require is the Manifold Absolute Pressure (MAP) sensor, P/N 0261230029. Advanced Auto has it for 72.99 but I kept looking and found that Amazon had it for $54.00. I installed it, cleared the codes and Voilà, runs perfect!

Thanks SuperHerman and FLXC90 for all the assistance, hope this P/N info and source helps another Volvo owner.