02 sensor codes/turbo control valve

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Hey, Ive had a constant problem with my s60 2.4t for a couple years now. Whenever I hold full throttle it goes into limp mode after about 6 seconds of full boost(1.0bar..stage 3 tune/supporting mods) Originally fixed the problem with new heavy duty turbo control valve, silicone vacuum lines, and replaced the turbo outlet hose which had a huge rip in it. Ofcourse the problem is back, but it seems to happen much quicker in the summer months, during cold weather it will often not hit limp mode(brutal limited 5psi) Ive replaced plenty of parts to deal with boost including compressor bypass valve and spring, all vacuum tubing, heavy duty turbo outlet hose and intercooler inlet hose (IPD`s), boost pressure sensor,intake air temperature sensor, fuel injector gaskets, and I`ve gone over everything that holds pressure when in boost not finding any more leaks (also used a smoke machine that incorporates 10 lbs of pressure with the smoke) So im starting back over from scratch and trying to get rid of all my DTC`s . Im getting P0137, P1132, P1237. Just replaced both 02 sensors about a year ago, so they shouldnt be bad already so Im assuming its something else upstream of the sensors. plugs and regular tune up items are well maintained. None of the vacuum lines appear to be pinched or loosely connected limiting flow either ANY help is GREATLY appreciated thanks in advance

thompson07 in Buffalo NY

May 11, 2011

1 Reply

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patrick mannionon May 11, 2011

As you probably know the codes are for front and rear O2 sensor problems but the P1237 code is for turbo control system fault which will make the O2 sensors read out of spec. Replacing parts without proper diagnostic tests usually is not cost effective. There is a company that independent auto repair shops buy their information from that the same information inexpensively to do it yourselfers. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online Alldata has the best tests and trouble shooting flow charts, use the A-Z search enter the trouble cod and follow the instructions. The best course of action would be find a Volvo specialist in your area. Using a professional grade scan tool lets you monitor sensor values and catch something that may be out of the normal. If you find a repair shop you like and they are stumped there is a professional service called Identafix. http://www.identifix.com/info/about_us.htm They only deal with professional repair shops. They are in the Minnesota 651-633-8007. Your auto repair shop do all their diagnosis tests, and discuss your problem with a team of professional technicians great service cheap and very bright people. If the repair shop that are repairing your car are stumped this is a great service. This company only deal with automotive repair shops and don't answer questions for the general public but are an amazing knowledge base.

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