jasejase Posted July 22, 2010 Posted July 22, 2010 So our 05 2.5i (stock), has thrown three P0420 codes in the last 6-8 months. First one was cleared, and came back about 4-5 months later... So we thought it was a bad tank of gas, etc. Second one was cleared, and it has now come back for the third time, just about a month or so later. Can't be three bad tanks of gas. So, since it's all stock... Where should i begin? 05... 88k miles or so. Original CAT. Original O2 sensors. Seems like the consensus is to replace the downstream/rear o2 sensor, and start there? Sounds plausible, and also the cheaper of the two sensors... THoughts? thnks
GEE-OTTO Posted July 22, 2010 Posted July 22, 2010 Well stock cats are designed to last the life of the car however the don't you can replace the sensor first if you get P0420 MIL again time to replace the cat-pipe. The sensor reads the composition of the gases flowing past it. You can get that cat section for under $300 NOT from Subaru
jasejase Posted July 22, 2010 Author Posted July 22, 2010 Sounds good... Would a fault in the rear o2 sensor do anything to the gas mileage.. mpg seems to have deteroirated over the past year or so.
GEE-OTTO Posted July 23, 2010 Posted July 23, 2010 Sounds good... Would a fault in the rear o2 sensor do anything to the gas mileage.. mpg seems to have deteroirated over the past year or so. yes however the front sensor controls AFR's it may be sensing a rich or lean condition coming from upstream (the actual cylinders) OR it has failed and is throwing the timing/firing of causing the rich or lean condition. See how this is a revolving door ???? However it is best to start at the sensors and cat first then reset the ECU (take off red terminal pump brakes turn on lights beep horn etc anything to use up stored voltage in the system) re connect red terminal turn key to ON DONT START! Let the fuel pump prime and the throttle position sensor calibrate ( this takes about 10 seconds) then start
jasejase Posted July 24, 2010 Author Posted July 24, 2010 Will do. Ordered up the o2 sensor, and should hopefully have by today or monday! I will report back. Thanks for your help.
GEE-OTTO Posted July 25, 2010 Posted July 25, 2010 this thread must be contagious guess what happens while driving today? P0420 pulled the code says its bank 1 cat deficient blah blah. Where did you get your rear sensor and how much was it ?
jasejase Posted July 26, 2010 Author Posted July 26, 2010 hahahah!! oops! Rock Auto - The Denso one, was 63.00 shipped with priority mail. Priority got in here on saturday, and i ordrered it thursday morning. Not bad! http://www.rockauto.com/ p/n: 2344732 (234-4732)
GEE-OTTO Posted July 26, 2010 Posted July 26, 2010 Before i order I will test the connections about 5 months ago same thing happened checked the rear O2 plug and one of the wires had backed out of the plug like it had a bad retainer or something. If that doesn't solve it ill swap it out it has 60K on it anyway could stand to be changed. Thanks
GEE-OTTO Posted July 26, 2010 Posted July 26, 2010 Dealer wants $167.00 for the post-cat (grey) and $187.00 for the pre-cat (orange) plus .5 hour install for both @ $125.00/hr Well now that I have my Monday laugh, resulting from yet another stealer quote, I can continue with my day.
jasejase Posted July 26, 2010 Author Posted July 26, 2010 wow... i will take the 10 minutes and 63.00 bucks and do it myself ! $230.00 is nuts. Looking at some of the forum posts, ppl have been quoted EVEN HIGHER! insanity. What is even more troubling, is the inconsistency in quotes from various subie dealers.
GEE-OTTO Posted July 26, 2010 Posted July 26, 2010 wow... i will take the 10 minutes and 63.00 bucks and do it myself ! $230.00 is nuts. Looking at some of the forum posts, ppl have been quoted EVEN HIGHER! insanity. What is even more troubling, is the inconsistency in quotes from various subie dealers. AGREED! The stealers quote low and high ( but still all higher than other outlets). Sad part is some people just take it up the anus or don't care. I can afford the parts and labor easy that is never the problem but when you can find the EXACT same part for $104.00 cheaper I can't go along with such a load of shizzle. If only somebody could get a load of XM/SIRIUS modules and sell them at 50% of stealer cost
jasejase Posted July 26, 2010 Author Posted July 26, 2010 LOL agreed! The only reason to hit the dealer is those darn subie bucks! typically makes for a cheap maintenance program!
jasejase Posted July 27, 2010 Author Posted July 27, 2010 replaced the rear o2 sensor. a bit tougher than i had anticipated. This thing was ON THERE!!!! i hit it with PB Blaster 4 or 5 times... and used an o2 wrench. It finally went when i used my jack handle as a breaker bar extension. now, we'll wait and see if the 0420 code comes back....
GEE-OTTO Posted July 28, 2010 Posted July 28, 2010 So i get in my car this morning and the CEL is gone no blinking "cruise" nothing WTF
jasejase Posted July 28, 2010 Author Posted July 28, 2010 Thats interesting... even if it cleared up, i thought you would need a code/battery reset to clear it out. I guess the ecm could have figured it out, but i would think that it would have needed a good amount of start cycles before it cleared out.
GEE-OTTO Posted July 28, 2010 Posted July 28, 2010 Well i ordered the sensor so i will go ahead and install then reset it can't hurt
jasejase Posted August 13, 2010 Author Posted August 13, 2010 so the P0420 code came back after the rear o2 sensor replacement... ANy chance its the front sensor?? Or is this basically a Cat Convertor job?
GEE-OTTO Posted August 13, 2010 Posted August 13, 2010 No it came and went with the old sensor so i put a new one in so i wouldnt have to look at the CEL
jasejase Posted August 13, 2010 Author Posted August 13, 2010 Nice! However, my CEL came back on after i did the rear 02 sensor... From what i gather - the front 02 sensor wouldnt be throwing 0420 code... Right? So that means, i move on to a CAT replacement at this point?
GEE-OTTO Posted August 13, 2010 Posted August 13, 2010 Nice! However, my CEL came back on after i did the rear 02 sensor... From what i gather - the front 02 sensor wouldnt be throwing 0420 code... Right? So that means, i move on to a CAT replacement at this point? Yup that rear O2 is nothing more than an annoyance it sniffs and says YAY or NAY. If you have a bad cat that is going to be expensive as a replacement manifold from Subaru is over $600 but if you have a 05 it wont be nearly as bad.
jasejase Posted August 13, 2010 Author Posted August 13, 2010 im thinking NON oem CAT, right? Looks like its just some rusty bolts holding this thing on. im sure they are a ()*$@#)( to get off though. this is the piece i need right? http://cgi.ebay.com/ebaymotors/SUBARU-Legacy-2-5L-2004-2005-Catalytic-Converter-_W0QQcmdZViewItemQQitemZ180544851518QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
GEE-OTTO Posted August 13, 2010 Posted August 13, 2010 Yeah that is the one you 05 guys are lucky in every exhaust sense of the word
jasejase Posted August 16, 2010 Author Posted August 16, 2010 so, there is a left and right cat on our 05... UGH. which led me to do more research, and alot of ppl seem to think that the upstream o2 sensor can lead to the p0420. Now im thinking, perhaps i should the upper sensor, before i spend $500 for the driverside and p/s side cats (total)... oh, btw - Dealer wanted about $1800 for both sides... WITHOUT labor.
GEE-OTTO Posted August 17, 2010 Posted August 17, 2010 so, there is a left and right cat on our 05... UGH. which led me to do more research, and alot of ppl seem to think that the upstream o2 sensor can lead to the p0420. Now im thinking, perhaps i should the upper sensor, before i spend $500 for the driverside and p/s side cats (total)... oh, btw - Dealer wanted about $1800 for both sides... WITHOUT labor. Oh Oh Oh you have that massive manifold you are unlucky I forgot that that could be a possibility for your 05ers you have a manifold that is very long and in two odd piece that unbolt right past the passenger side primary. If you get a chance look under you car and count the sensors I think you guys have three one on each primary and one near the rear flange. You could convert it to the other style 2005 layout which is wayyyyy cheaper
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