October 28, 201411 yr Silly me, thought I could just swap out old suspect O2 sensor with a known good one. Not being a turbo, or even a real EA82 - I have an EA82 Y pipe on my EA81 and want to use the O2 simply for monitoring or tune up. Slide underneath armed with a 22mm ring spanner and find heat shield all over the place covering the hex of the O2 sensor. Even if I had a super long 22mm socket, the socket would hit the engine cross member A trial of CRC556 on heatshield bolts and their captive nuts reveals all is not gonna be pretty. I will also need to at leasst drop the pipes off the heads or totally remove to change out this service item. Might just have to snip heatshield a bigger hole .....
October 28, 201411 yr yup...I just did mine recently and had to remove heat shielding and drop the y pipe to get access to the sensor. It wasn't too bad and everything came free without much trouble. Here's my experience report and help from others. http://www.ultimatesubaru.org/forum/topic/149145-code-32/
October 29, 201411 yr I haven't had an exhaust system with heat shields in a loooong time. Although, the 93 I just got from a guy in CA still has OEM. But I expect that O2 sensor will not come out easily. I'll probably put the all stainless exhaust I made on it when that sensor or the cat fails. It'll be easier.
October 30, 201411 yr I just did mine I used a good o2 sensor socket and a shot of pb blaster came out very easy but I already had the exaust off the car
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