What would cause both catalytic converters to fail on a 2005 Outback with 101,000 miles?


Asked by Jan 04, 2014 at 04:52 PM about the Subaru Outback

Question type: Maintenance & Repair

5 Answers

Nick Eidemiller

Just the fact that catalytic converters dont last forever. It can depend on how it's being driven too, stop and go or short trips are harder on your converters than highway miles are.

3 out of 3 people think this is helpful.

If it didn't die of natural causes as Nick said catalytic converters can be killed by misfiring, engine coolant or engine oil contamination, overheating, and thermal shock. What prompted you to replace yours? HTH. -Jim

1 out of 1 people think this is helpful.

Plenty of things could have happened, or combinations. Driving duty cycle determines most of this. Short trips, numerous engine shutdowns and restarts result in many thermal cycles. When the car is cold, it uses more oil, that oil hurts catalytic converters. Then there is the rich air-fuel ratio when the engine is cold that loads the catalytic converter. These short trips, short thermal cycles just don't let the catalytic converters to get hot and stay hot to burn off and pass the loads with out accumulating on the catalytic converter. A lack of a couple good highway runs every once in a while to purge the catalytic converter can hurt. Also could have been bad fuel, contaminated fuel. It is important to make sure a car with catalytic converters does not have misfires which would overload the catalytic converter.

2 out of 2 people think this is helpful.

Check with your dealer, they have had problems. The dealer replaced mine w/o charge. The warranty should be 10-15 years on those.

1 out of 1 people think this is helpful.

I think the federal required minimum warranty is specified in years, not sure how many. Check the owner's manual, the info is in there.

Your Answer

Add photo

Related Questions

  • Subaru Outback 2007 catalytic converter replacement 20 answers

    Had issues with the catalytic converters on my Outback for a while now. 2 times had the computer reset, with Subaru telling me it will cost $5,500.00 to have them replaced. I've looked elsewhere but...

    2007 Subaru Outback 2.5i Basic


    Maintenance & Repair

  • I had one catalytic converter replaced in AUG 2014, would there be any need to replace both in April 2016? 4 answers

    2005 Subaru Outback 3.0R


    Maintenance & Repair

  • So many problems--is it normal? 28 answers

    My 2000 Outback has 144,000 miles, and I've had to put SO MUCH money into it! Here are a few repairs: Two new front axles (right and left), new CV Boots, new axle boots, catalytic converter, head ga...

    2000 Subaru Outback Limited Wagon


    Maintenance & Repair

  • 2000 Outback 3 answers

    2 questions- My check engine light is on. Reader says it is the catalac (sp?) converter. Repair shop says this costs $1600 to fix. Can I get it cheaper? Second My Outback has a clutch, at about 60...

    2000 Subaru Outback Base Wagon


    Maintenance & Repair

  • Buying a high mileage used Outback. 8 answers

    I am looking into buying a 2007 Subaru Outback that has 200,000 miles. My question is: what should i consider when buying this vehicle? What are known issues, maintenance, how much will it cost me...

    2007 Subaru Outback 2.5i




Looking for a Used Outback in your area?

CarGurus has 30,291 nationwide Outback listings starting at $1,295.


Search Subaru Outback Questions

Subaru Outback Experts

#1 Markw1952
Reputation 4,240
#2 FordNut
Reputation 1,470
#3 TheSubaruGuruBoston
Reputation 1,070
View All

Related Models For Sale

Used Subaru Forester"
324 Great Deals out of 19,839 listings starting at $1,099
Used Subaru Legacy"
249 Great Deals out of 17,733 listings starting at $1,295
Used Subaru Impreza"
251 Great Deals out of 8,386 listings starting at $1,995
Used Honda CR-V"
1,630 Great Deals out of 81,344 listings starting at $1,695
Used Toyota RAV4"
1,174 Great Deals out of 48,250 listings starting at $2,495
Used Subaru Crosstrek"
7 Great Deals out of 7,473 listings starting at $20,998
Used Toyota 4Runner"
381 Great Deals out of 18,520 listings starting at $2,400
Used Toyota Highlander"
633 Great Deals out of 30,395 listings starting at $1,990
Used Subaru XV Crosstrek"
127 Great Deals out of 2,644 listings starting at $9,995
Used Toyota Tacoma"
634 Great Deals out of 30,000 listings starting at $2,850
Used Jeep Grand Cherokee"
1,210 Great Deals out of 73,903 listings starting at $1,200
Used Honda Accord"
1,282 Great Deals out of 78,151 listings starting at $1,395
Used Subaru Impreza WRX"
48 Great Deals out of 1,353 listings starting at $2,500
Used Toyota Camry"
1,677 Great Deals out of 97,671 listings starting at $895
Used Honda Pilot"
583 Great Deals out of 19,396 listings starting at $1,800