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QUESTION: Hi Ted

I have an 01 corolla S automatic with 144K. Recently a check eng scan is throwing 0420 code. I was told its the CAT converter and quoted a $1475. price. The garage said he will not put an aftermarket CAT on due to the check eng light not going out. Am I being taken or will the aftermarket CAT take care of the problem?  

Thank you.

ANSWER: Hello, I see no problem using an aftermarket cat, since you are in Pennsylvania you can use a "49 state" cat which is legal anywhere except California, just use a good quality not the real "cheap" ones, I had one put on my 04 matrix last year at a muffler shop for $800 and this was the more expensive California certified model, no problem, I would advise that you have a muffler shop do the whole job, they will usually give you a warranty at about half the cost you mentioned.

---------- FOLLOW-UP ----------

QUESTION: My Corolla has been using oil however no one is able to find the problem. No leaks anywhere. The car runs great.  I did check 2 muffler shops for the converter and they quoted me $400. & $700. sure is a big difference in price. Thank you so much.

Answer
Thanks for the reply, some of these Corolla engines have some oil consumption issues, due to piston ring wear, using one quart in about 1000 miles is borderline but not that bad, so keep an eye on it and check to see just how much it uses. Toyota realized this problem and had issued a service bulletin to replace the pistons and rings with updated parts, doing this may not be worth the expense, oil is relatively cheap so just keep adding as needed, unless there is lots of smoke from the exhaust I would not worry about it.

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Ted Ritter

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I have more than 28 years experience as toyota technician, I will be able to answer most questions related to the Toyota product line up to the present year models,I am located in the US but welcome questions from other regions of the world. When asking a question please provide specific information: year,model, engine,transmission information. Provide as much information as possible including a brief repair history if possible. I have been a volunteer here for more ten years an have answered over 16,000 questions helping Toyota owners with their problems and save thousands of dollars without any compensation, some of my answers are published on many other websites including google and various automotive forums. DONATIONS ARE VERY MUCH APPRECIATED, IF YOU HAVE RECIEVED HELPFUL INFORMATION PLEASE MAKE A DONATION. AS OF TODAY (JULY 22, 2014) ALL REQUESTED GRAPHICS, ILLUSTRATIONS, DIAGRAMS, PHOTOS, WILL REQUIRE THE MINUMUM DONATION UP FRONT.

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Toyota technician since 1979,expert in electrical systems,OBD systems,engine repair, driveability problems,EFI systems,ASE certified,Toyota master technician.
Certified Hybrid Vehicle technician.

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Toyota master technician, ASE certified in eight catagories, Hybrid vehicle certified. Toyota technical training: Engine Automatic transmission Manual transmission Drivetrain Electrical systems Brakes and chassis Air conditioning Engine performance and diagnostics Hybrid systems

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