October 9, 200421 yr Patience NEWBIE The 98 Legacy 2.2 L has 150,000 Km's (90,000 mi) and has never had a fault. This MIL P0420 just came last week. The local Subaru dealer made no more detailed analysis than I did with my OBDII tester. They wanted to first replace the rear O2 sensor, then the cat. (300+1000=$1300 CND). Whoa. BUT I got an OEM Bosch O2 sensor, then had a good known pipe bender replace the Cat. I have spent $350, BUT still have the P0420. Before I throw more at it, does anyone have a knowledge of this problem or at least a better troubleshooting scheme? I would appreciate any help.
October 9, 200421 yr i had the same code. dealer replaced both cats under fed 6yr/80k emissions warranty. your dealer will have a printout of the in-service date if you are not the first owner. this one was on subaru, at least for me. would have been a $1200 repair ticket. see if they'll honor this warranty. the code, incidentally, was a cat low bank efficiency. 99 leg l sedan 2.2l 5-sp 25th anniv burgundy
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