sks40 Posted October 4, 2016 Report Share Posted October 4, 2016 My sons '01 S40 is giving the P0236 and P0237 codes for the boost pressure sensor 1. According to VIDA, this is the sensor on the intercooler. VIDA mentions causes to be: 1) dirty electrical contacts, 2) open circuit in the harness, 3) sort circuit in the harness or 4) bad sensor. I inspected the connectors and harness but didn't see any issue. Given that these things seem to be a common failure, I replaced it with a new Bosch sensor but still get the code. Thinking it might be the one on the intake manifold instead, I reinstalled the old one in the intercooler and replaced the one in the intake manifold with the new one. Still no joy. Elsewhere on the internet I have read folks reporting that this could be caused by a bad TCV or a leak in the intake pipes from the turbo to intercooler to intake. Any of this true? Any ideas where to go next? Thanks Stan Link to comment Share on other sites More sharing options...
Ol' Dirty Noodle Posted October 4, 2016 Report Share Posted October 4, 2016 6 minutes ago, sks40 said: My sons '01 S40 is giving the P0236 and P0237 codes for the boost pressure sensor 1. According to VIDA, this is the sensor on the intercooler. VIDA mentions causes to be: 1) dirty electrical contacts, 2) open circuit in the harness, 3) sort circuit in the harness or 4) bad sensor. I inspected the connectors and harness but didn't see any issue. Given that these things seem to be a common failure, I replaced it with a new Bosch sensor but still get the code. Thinking it might be the one on the intake manifold instead, I reinstalled the old one in the intercooler and replaced the one in the intake manifold with the new one. Still no joy. Elsewhere on the internet I have read folks reporting that this could be caused by a bad TCV or a leak in the intake pipes from the turbo to intercooler to intake. Any of this true? Any ideas where to go next? Thanks Stan If you're getting both codes you might need to replace both, or he's got a massive boost leak from one of the IC hoses, or hoses on the throttle body. Cover the hoses in soapy water and rev the motor to see if any bubbles appear. Also how does it idle? Link to comment Share on other sites More sharing options...
sks40 Posted October 7, 2016 Author Report Share Posted October 7, 2016 Good thought about the IC hoses. I suppose that it could cause an intermittent leak. The CEL is off on its own now. I had tried to clear the code with a code reader and VIDA/DiCE. Perhaps it took some run-time to truly clear. My son says the car is running better and idles smoother. Still have the heater issue. From what I read on the UK forum, it looks like we probably have a bad damper motor. Link to comment Share on other sites More sharing options...
Phixion Posted October 7, 2016 Report Share Posted October 7, 2016 Check the S-shaped hose that's right at the front of the car just under the IC hose. This hose goes to the TB if I remember correctly and is a different diameter on each end, so not a very common hose to find a replacement of. Generally only a Volvo hose is what you'll have to get. I replaced that one on my S40 and a local specialty mechanic told me that's one of the most common hoses to fail after the elbow at the upper radiator hose. When that hose I speak of goes, you'll get almost NO boost pressure, and 2-3 CEL codes as well. Link to comment Share on other sites More sharing options...
Ol' Dirty Noodle Posted October 7, 2016 Report Share Posted October 7, 2016 2 hours ago, Phixion said: Check the S-shaped hose that's right at the front of the car just under the IC hose. This hose goes to the TB if I remember correctly and is a different diameter on each end, so not a very common hose to find a replacement of. Generally only a Volvo hose is what you'll have to get. I replaced that one on my S40 and a local specialty mechanic told me that's one of the most common hoses to fail after the elbow at the upper radiator hose. When that hose I speak of goes, you'll get almost NO boost pressure, and 2-3 CEL codes as well. Na you won't be able to idle,that's the hose to IAC, soon as throttle is applied the valve closes and any rips are null & void, let off and the car will die Link to comment Share on other sites More sharing options...
Phixion Posted October 11, 2016 Report Share Posted October 11, 2016 On 10/7/2016 at 0:02 PM, Ol' Dirty Noodle said: Na you won't be able to idle,that's the hose to IAC, soon as throttle is applied the valve closes and any rips are null & void, let off and the car will die When that hose split for me, the car WOULD run both with throttle and at idle... Just had 0 boost and gave 3 CEL codes. On the other hand, when the brake booster line to the TB popped out, the car died and would not run at all. Link to comment Share on other sites More sharing options...
Ol' Dirty Noodle Posted October 11, 2016 Report Share Posted October 11, 2016 Odd, Did you have a 00? An 00 prob would hold idl because the sensors would be post leak if I remember correctly Link to comment Share on other sites More sharing options...
Phixion Posted October 12, 2016 Report Share Posted October 12, 2016 Mine was an '01. Much different though? It was the small diameter S shaped hose just under the large upper IC hose. Link to comment Share on other sites More sharing options...
Phixion Posted October 12, 2016 Report Share Posted October 12, 2016 It was this hose... Link to comment Share on other sites More sharing options...
Ol' Dirty Noodle Posted October 12, 2016 Report Share Posted October 12, 2016 No the hose is same,that's not what's different. You Prob an early 01 with the old sensor setup like a phase 1, phase 2s have both the map and IAT sensor on the IC pre hoses, phase 1s have the map sensor post IC/TB which is why it might be able to hold idle despite the hose having a small tear. On a phase 2 the calculations have been made by the ecu before the air starts leaking which is why the car won't idle Link to comment Share on other sites More sharing options...
Phixion Posted October 12, 2016 Report Share Posted October 12, 2016 I gotcha. Mine wasn't a tear though, the hose completely severed itself at the one of the connection points. I always thought I had a P2, but maybe not? It had many of the P2 changes. I know that the car was driveable when the hose split, but just ran extremely poorly and rough, had no pickup but idle was OK the day or so I drove it that way. Link to comment Share on other sites More sharing options...
sks40 Posted October 13, 2016 Author Report Share Posted October 13, 2016 As I recall, there were some Frankin40s which were an odd mix of Phase 1 and Phase 2. I haven't had chance to check my son's IC hoses but it is running good with no CEL. That reminds me... he needs to take it for emission testing. Link to comment Share on other sites More sharing options...
Ol' Dirty Noodle Posted October 14, 2016 Report Share Posted October 14, 2016 Yea basically a handful of early MY 01s built in early 2000 had ph2 exteriors motors/trans but had some ph1 sensors like the IAT, MAP and one other. Link to comment Share on other sites More sharing options...
Phixion Posted October 14, 2016 Report Share Posted October 14, 2016 I never knew that. Unfortunately I don't have the year that it was built any longer and don't remember it offhand I do remember that it had the P2 suspension and exterior details, but it also had a MAP sensor as I was able to read MAP readings through the OBDII port... Link to comment Share on other sites More sharing options...
sks40 Posted October 15, 2016 Author Report Share Posted October 15, 2016 Well my son's S40 made it through emission testing today, woo hoo! Link to comment Share on other sites More sharing options...
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