Never ending P0171 P0174 at idle
Thread Starter
Member
Joined: Jun 2011
Posts: 163
Likes: 0
2003 C32, 2002 S55, 1999 SL500, 2004 S430
Never ending P0171 P0174 at idle
On my 02 S55 160k miles I've been trying to solve these codes. The p0171 and p0174 only gets set after an extended period of driving and only at an idle. I've found good reason to change the following parts which have not solved my problem:
1. OE Mass air flow
2. New k&n filters
3. OE fuel filter
4. Valve cover gaskets and pcv hoses
5. Right side diverter valve
I ordered new intake manifold gaskets to be installed tomorrow. Any other suggestions?
My sds shows all o2 sensors are working correctly.
Is there a common place the intake manifold may have a hair line crack?
1. OE Mass air flow
2. New k&n filters
3. OE fuel filter
4. Valve cover gaskets and pcv hoses
5. Right side diverter valve
I ordered new intake manifold gaskets to be installed tomorrow. Any other suggestions?
My sds shows all o2 sensors are working correctly.
Is there a common place the intake manifold may have a hair line crack?
Thread Starter
Member
Joined: Jun 2011
Posts: 163
Likes: 0
2003 C32, 2002 S55, 1999 SL500, 2004 S430
I replaced the TB to Elbow rubber seal and reset the mixture adaption. So far 100 miles with out the code coming back on, all monitors are ready except for the evap, I've tried to complete the drive cycle twice.
The old seal was starting to get hard and would crack a bit when you bend it. I would say its safe to assume when your pcv hoses start getting brittle you can expect this seal to start going bad also.
The old seal was starting to get hard and would crack a bit when you bend it. I would say its safe to assume when your pcv hoses start getting brittle you can expect this seal to start going bad also.
Thread Starter
Member
Joined: Jun 2011
Posts: 163
Likes: 0
2003 C32, 2002 S55, 1999 SL500, 2004 S430
After 300 miles the codes have came back on.
I think I'll end up buying a smoke machine.
For future search purposes my iPad scanner shows these codes as P0170 & P0173 where as my sds shows P0171 & p0174
Also to add to the parts replaced list is:
#6 OE maf rubber seal and TB rubber seal
I think I'll end up buying a smoke machine.
For future search purposes my iPad scanner shows these codes as P0170 & P0173 where as my sds shows P0171 & p0174
Also to add to the parts replaced list is:
#6 OE maf rubber seal and TB rubber seal
