Hi, newby hear trying to get some help with regard to an intermittent limp mode issue.
The cars a V70 D5 2004 with 171,000 miles on it. Probably worth under £2k so I don't want to throw too much money at it.
It happened under hard acceleration onto a main road, thereafter it went into limp mode whenever I accelerated hard. If I turned the engine off and re-start it was fine until accelerating hard again. I took it to my local garage and they diagnosed a sensor mounted on the radiator casing (is this the mass air sensor?). With that replaced they test drove it and found that the fault still occurred and advised me that the turbo needed replacement.
I took the car to a Volvo garage who said it was unlikely to be the turbo and thought it likely to be coking up of air intake downstream of the exhaust gas recycle connection, with this restricting flow. They said the delta between the flow calculated set point and the actual flow recorded would put the engine into a limp mode to protect it. Cost estimate for a decoke was £450 with risk that if the injectors were seized in then they would be £250 each to replace.
I now notice that after the sensor replacement the problem doesn't occur when the car is warmed up; no matter how hard I accelerate it performs fine. However, when not fully warmed up I can get the problem to occur; the computer message is engine service required.
Does anyone have any similar experience and is there a product that can clean out the air intake system without dismantling (if that is the likely problem). Any help would be really appreciated
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