P0852 & P0037... frustration continues

**moodraman** · #1: 08-14-2011, 03:50 PM

So... This is driving me NUTS!!! A while back I threw a P0037 and start getting HORRIBLE gas milage as well as my car ran like poop. my investigation looked like it was the rear02 sensor... so I ordered a used on off a member on the site... that solved my problem for about a month, until I threw another 0037 code...

I didn't have the time to deal with it so I just left it for a while...

Well recently I got my sh!t together and ordered an brand new rear 02 sensor figuring the used one was close to going bad. So today I did my brakes and went ahead and put on the new rear 02 sensor and reset the battery to clear any codes...

So I just fired it up... and now I have a new code... in addition to my same p0037.

P0852 - Neutral Switch Input Circuit High
P0037 - Rear O2 Sensor Heater Control Circuit Low

I couldn't find anywhere that the wiring looked bad... everything looked fine to me... this is driving me nuts... I want my car back!!!!

I have a stage 2ish car... Downpipe, uppipe VF52, upgraded Fuel Pump and Injectors, and a pro-tune.

Any ideas... I couldn't find much on the forums about the P0852 code.

**NSFW** · #2: 08-14-2011, 10:45 PM

I vaguely recall something about an issue with the neutral switch in 05s that had Subaru TSB for it, but I don't remember the details. Does that sound familiar to anyone?

Since the P0037 come back after replacing the sensor, I'm guessing your sensors are actually fine. Did you take a close look at all of the connectors between the sensor and the ECU? I know there's one that's a foot or two away from the sensor itself but I'm not sure if there are others.

Circuit Low" sounds to me like an open circuit. (There's also Circuit High, which I suspect means a short.) Can anyone confirm or dispute? If I'm right, disconnecting and reconnecting the connector a couple times might be all it takes to get some crud off of a dirty contact.

**NSFW** · #3: 08-14-2011, 10:46 PM

BTW, another current thread about the 0852 code:

http://legacygt.com/forums/showthrea...es-168126.html

**moodraman** · #4: 08-17-2011, 10:52 AM

Thanks!

P0037 got cleared when I discovered it was unplugged closer to the engine!!

<<<<don't worry I made my wife smack me in the back of the head for this one>>>>

So I reset the ECU but about 15 min of driving and the 0852 came back.

**moodraman** · #5: 08-17-2011, 10:53 AM

Quote:

Originally Posted by NSFW

BTW, another current thread about the 0852 code:

http://legacygt.com/forums/showthrea...es-168126.html

uh... that's a link back to this same thread

**NSFW** · #6: 08-17-2011, 01:21 PM

http://legacygt.com/forums/showthrea...-1-130464.html

D'oh!

**moodraman** · #7: 08-26-2011, 11:20 AM

anyone who've seen this? any home tuners out there ran into it?

**bmx045** · #8: 08-28-2011, 07:19 AM

I found it to be tune related for one reason or another, nothing mechanically was faulting, so I disabled that cel, all is well, cruise works fine...still....

**moodraman** · #9: 10-17-2011, 11:28 AM

still tossing this code... any new one's encountered this?

**wadi23** · #**10:** 10-15-2012, 07:38 PM

Quote:

Originally Posted by moodraman

Thanks!

P0037 got cleared when I discovered it was unplugged closer to the engine!!

<<<<don't worry I made my wife smack me in the back of the head for this one>>>>

So I reset the ECU but about 15 min of driving and the 0852 came back.

HEY can you tell me where the connector that's closer to the engine is? the connector at the bottom of the car is fine