DM6156

I checked it out with my auto xray 6000 scanner. no lazy oxygen sensor. nothing seemed out of the ordinary, no pending codes either. Also, computer hadn't been reset in over 8,000 miles when i looked prior to making the "fix". based on milage, it would have been reset prior to me purchasing it. I'm assuming resetting computer by unplugging battery would cause computer to log being reset, but maybe not. I wish i would have saved the data or made notes, i'm curious about some of sensor data like air intake temp and coolant temp. The tech that did the work at the local shop told me the subaru tech he spoke to doesn't even open the hood to install the transmission cooler, all the work is done from under the car. I can call shop tomorrow and see if they unplugged battery for any reason. I've been using this shop for several years exclusively. I recommend everyone i know to take their vehicles there. The shop manager's dad used to run parts department for the subaru side of the dealership, he used to work as tech for the chrysler side.

sorry for the delay, was doing a lot more driving mixed city/highway and strickly in town (under 45 mpg). Problem has been "resolved" for about 9 tanks. I found the sound damper (plastic) under the hood was just laying on the engine, not installed correctly. I actually fixed this prior to the trip from ga to nc. This is why i said it was a silly "fix". Didn't make any other changes to vehicle (same oil since shop changed it, same tire pressure, same air filter, etc). Filled up prior to leaving on the ga to nc road trip at same gas station usually fill up at. Previous tank to this fill up from same station was in 15 mpg range. On the first leg of trip, saw over 23 mpg. Constantly saw over 22 on mostly highway driving (4 tanks). Saw over 19 on mixed (45% highway - 55% city). Mixed with < 25% highway in 17 mpg range. Unless someone has a better explanation, I'm assuming it was a heat issue as the damper has room for air flow between it and engine when installed correctly. However, this was not the case with it laying right on top of engine. I'm sure there are some that will blame gas, I'm not seeing that. It would have taken 5 tanks to get rid of the "bad" gas and just happened to get better when i fixed the damper and on the first tank of the road trip.

No hypermiling. 70-75 mph on highway (ga to nc) 2nd tank since "fix" (90% highway) was 23.2 mpg. will post more after doing more in town driving.

air filter is good. Fuel filter part of pump in tank - not easy swap not sure where pcv valve is to check. couldn't find any info on location. I suggested to out of state dealer taking it to them - on trip and would be in area - that's when he said he wouldn't no where to start. his words, not mine. He was even against removing cooler. Regardless, I may have fixed it (silly little fix too) All highway trip, 23.1 MPG. best yet. Best highway prior was 22.4 will check back after tank of mixed driving

Problem is getting worse. Last fill up 13.8 mpg. It's gone down now at each fill up since having the cooler installed. I have no pictures, the cooler is behind the bumper. The shop I had install it has spoken to several subaru techs at local dealers. No one can explain this - noone has any suggestions. I called a subaru dealer in another state. The guy who I spoke to made this comment "I wouldn't know where to begin to troubleshoot this". that doesn't give me much confidence in subaru! Using gas from same stations, in my wrangler my fuel economy has actually gone up about .5 mpg. Tribeca gone down 6 mpg. Shop changed the transmissions fluid when they installed the cooler. I'm told filter is part of pump - $15 part with $225 labor to replace. air filter is still good, double checked that last night. Tire pressure still good, double checked that as well. Still no codes or pending code. I couldn't find any info on pcv value location , etc. I'm all out of options, I guess the next step is to have the cooler removed.

Yes, they used the right oil. Tire pressure is good. I do not believe they disconnected the battery as the radio presents were still the same and the integrated garage remote still worked. The transmission shifts better (smoother) than before the install. Have not been running A/C more than normal. Thanks

No codes set or pending (I have autoxray 6000 scanner). I get fuel at the same stations I always have. I have not seen a decrease in fuel economy in my wrangler and i'm using fuel from same stations. Air filter was changed about a month ago. Tire pressure Is ok. Thanks

Had a local shop install the Subaru transmission cooler in 08 Tribeca (41k miles) and they also changed the oil. Prior to the transmission cooler installation I was getting 19-20 mpg, since the install (3 fill ups), I've gotten 16-17 mpg. This is real-world fuel economy, I always divide miles by gallons at every fill up. Same shop changed the oil the last time. This is the 2nd oil change I've had down since owning the vehicle. Has anyone seen this before? Thanks