I think you need some more digits there. P1234I have read extensively about the p071 and p074 lean codes. I could not find anything related to both codes being thrown at the same time. Both codes are currently being thrown, poor gas mileage and overheating on extended inclines.
fixed thread title.Sorry. That would help.
p0171 and p0174
2006 Outback with H6 engine 5EAT tranny.
I don't know what hasn't been done to this car. We inherited about a year ago from my father. I have stacks of paper work. Engine and tranny have been replaced after mutiple head gasket issues. Plus a ton of other smaller things.
But nothing has been done to the car recent to the codes showing.
Thanks.fixed thread title.
front o2 sensor changed ?
radiator changed? if so with what, does it have a OEM thermostat and OEM rad cap? ($40 for that pair solve many a overheating problem.).
how many miles?
your code condition "might" make the engine run lean, ... and running lean makes for more heat.Thanks.
Radiator has been replaced.
Not sure if the front 02 sensor has been changed. Not sure about the thermostat and it does have an OEM cap.
188,000 on car, about 70,000 on engine
The car is fine around town. No overheating in traffic or elsewhere. Only on fairly long ascents does the car start to increase in temp.
Only run premium. I did put a can of Seafoam in it last night.your code condition "might" make the engine run lean, ... and running lean makes for more heat.
front o2 sensor makes that kind of code, and a few other things like MAP / MAF being dirty. but the o2 is kind of a cheap / easy fix, and they do wear/ age and get dirty , especially in cars that have engine problems. ($50-100 buys a denso branded one off rockauto or amazon....local parts stores like to rip the customer off for such things).
you might get some subsequent codes like a mild p0420, or minor misfires if things progress and you don't get a fix to the p0171/p0174.
are you running 91-93 octane?
chuck the K and N filter if its a wet type, and put on a OEM or similar paper filter. (some people here have done that on used subarus they have bought).Only run premium. I did put a can of Seafoam in it last night.
It is a CAI type so I imagine it is a wet filter. My only thought is it had the CAI long before the codes showed up.chuck the K and N filter if its a wet type, and put on a OEM or similar paper filter. (some people here have done that on used subarus they have bought).
I watched a mechanic swap 318 in a dodge.
the only reason he could see, = starved for air on a consistent basis as the wet filter never gets clean. (impossible to remove the fine dust ).
seafoam is great at fixing minor problems like gummy intakes on small engines, ....the best gas stablizer I ever used in can gas.
but I doubt you are going to get enough benefit out of it to fix the present issues.
subaru's oem is actually a good cold air intake with a snorkel, can't get any better (...although the companies that sell them want your money)It is a CAI type so I imagine it is a wet filter. My only thought is it had the CAI long before the codes showed up.
I love seafoam in my motorcycles so I thought I would give it a shot.