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Old 07-16-2006, 10:20 PM   #1
*** Banned ***
Member#: 116387
Join Date: May 2006
Chapter/Region: MWSOC
Location: Kalamazoo, MI
02 Straight pimpin

Angry O2/egt Help Please Please!!!!!

Hey guys,
I have a 02 wrx with 65,000 miles on it. It had an intake when I got it. As soon as I bought it and drove it home the cel came on about 40 miles into the trip. I got it home and took it to autozone. The cel codes were PO136 (o2 sensor circuit malfunction bank 1 sensor 2) and PO546 Exhaust Gas Temp. Sensor Circuit High bank 1 sensor 1). So I got home and joined this forum. I found some good info and decided that I need a stock air intake system. I talked to PC Tuner and he sent me one minus the snorkus. I just put it on today and reset me ECU. Wow is this thing quit now. Anyway about 40 miles later my cel came back on with the same codes. Could this just be from my o2 sensor because I havent changed it yet. Also what o2 sensor is it, I assume the second one, but were is it. My car doesnt seem to run very well, lack of power. Please help my car is comlpetly stock now and it lacks the power it did when i bought it. I bought it with 58,000 miles on it. Seems to miss a little to. Please help this egt thing is weird, I never heard of it. Some guy told me it could be my 1st o2 sensor not the second one please help car is stock. Also if it was the 1st o2 sensor wouldnt the code read (o2 sensor circuit malfunction bank 1 sensor 1) thank you guys-- Joe
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Old 07-16-2006, 11:07 PM   #2
Trust no one
Member#: 11170
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
02 WRX
15 WRX/05 GTO


Installing the stock intake was a good idea, but that wasn't the cause of those codes.
The 02 sensor code is for the second/rear (post cat) 02. It is possible the car previously had a catless downpipe before being returned to stock, and may have also had an electrical "fix" wired into the rear 02 circuit to prevent the catalyst inefficiency code P0420. Those electrical "fixes" will sometimes cause a code to set for the rear 02. You should check to see if such a fix is still installed on the car, and if it is remove it. If the car has a stock downpipe it is no longer needed. The wiring under the car to the sensor could also be damaged.
The P0546 code is probably from a missing or malfunctioning EGT probe, most likely the result of the car having had a catless uppipe installed at some point (which may or may not still be on the car). Depending on what uppipe is on the car there are a couple of possible remedies for this, either a resistor "fix" (if the uppipe is catless) or a new OEM probe (if the uppipe is stock).
From these symptoms it is probable that your car was modified by the previous owner and returned to a stock or near-stock condition before you bought it. This could present more problems down the road depending on the degree of modification and how it was driven.
I'd suggest that you find a good local shop that specializes in Subarus, and have them go over the car thoroughly to evalute its condition and correct any problems that exist.
It would also be helpful if you would complete your profile to include your car information and location.
You can post in your regional forum to find a nearby shop that people recommend.
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Old 07-17-2006, 12:30 AM   #3
Uncle Scotty
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Join Date: Mar 2002
OK buy Nates beans


Fill in your user profile so we know where to tell ya to go for 411....
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