Question about 2003 Toyota Corolla

1 Answer

I have a 2000 Corolla. Engine light was turned off by mechanic but came back on in 1 week. Should the catalytic converter be replaced?

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has answered 20 questions.

  • Expert
  • 117 Answers

If the code was (catalytic converter below threshhold) its more tlikely that you will not need to replaced the catalytic conv.but is a possiblity. First check your o2 sensors for proper function. These are electrical units in your exhaust that read your air/fuel ratio and are a lot more likely to malfunction.

Posted on Aug 19, 2010


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

My 2003 altima has a check engine light for about 2 weeks. I just started getting my battery and brake lights fluttering.hooked computer up to it. It said code p0420 catalytic converter low threshold.

Very common code on the Altima. You will need to replace your manifold/converter. There is also some concern over the converter material getting back into your engine causing further damage. You need to take care of this asap. IT WILL NOT BE AN 02 SENSOR!! Please don't let anyone tell you otherwise. for further information google QR25DE converter issue and happy reading. Many guys have replaced their converters with a header for piece of mind.

Nov 05, 2014 | 2003 Nissan Altima

1 Answer

Just had catalytic converter replaced. A week later the car developed a rattle while accelerating and the check engine light came on. Now the oil light is coming on while acceleratting

Sounds like the mechanic who changed the Cat Converter hit the wires to the oil sending unit or a metal shield on the engine that needed to be removed to replace the Cat was not put back properly and is so loose it is hitting the wire to the oil sensor... Get it checked out by a RELIABLE mechanic...

Dec 25, 2012 | 2004 Nissan Sentra

1 Answer

Engine Light on code PO 420

You Prabably need a new catalytic converter. Very common problem with toyotas. You will need to get a dealer part as the aftermarket converters will put your check engine light on eventually.

Dec 20, 2010 | 2000 Toyota Corolla

2 Answers

Toyota Corolla 2000 owner's manual

COROLLA 2000 120,000 MILES

Mar 10, 2010 | 2000 Toyota Corolla

4 Answers

Check engine light - catalytic converter problem

If you haven't replaced the O2 sensor that is causing your check engine light to come on by generating a fault code in the ECM, replace it first. Cleaning the Catalytic Converter is not the thing to do. Replacing the faulty sensor will pay for itself in the long run with the better fuel economy you will get.

Aug 14, 2009 | 2003 Toyota Corolla

1 Answer

2003 toyota corolla catalytic converter

If you want the check engine light to stay off, make sure that the converter is a direct fit, and not a universal. It should work fine then.

Jun 12, 2009 | 2003 Toyota Corolla

1 Answer

Check engine light on for sometime; Response to throttle sluggish

If your catalytic converter is "below efficiency" or otherwise clogged, you will lose power as you drive and the vehicle heats. The more you drive the vehicle, the worse the problem will become. The exhaust can't escape properly through the catalytic converter, therefore your engine won't run properly. Your issues are related, and if you replace your catalytic converter they should go away.

May 26, 2009 | 2001 Volkswagen Jetta TDI

1 Answer

Check Engine Lights On

if the code is for the rear cat o2 sensor i suggested to replace the cat. the rear o2 sensor is to tell the commputer ha good is the cats if the cat not burning the gas. the commputer need to see the o2 sensor to check the cat's

Apr 17, 2009 | 2000 Toyota Corolla

2 Answers

Check engine,2000 Nissan Maxima

yes there is two catalytic converters ???
one for any exhaust pipe bank (left & right) (bank 1 & bank 2 )
if you change the bank 1 ?? may be you need to change the bank 2 today?????
but not to change the same bank two time ???????

ask for more information

Jul 07, 2008 | 2000 Nissan Maxima

1 Answer

2000 Toyota Corolla SR 1598cc

If the code for the engine light is a Lien code:

Common problem is the Mass Air Flow sensor. Go to your local auto parts store and get a spray solvent to spray right past the air filter.
This will sometimes correct the engine light. Otherwise you may have to replace the MAF.
Do not replace the Catalytic Converter or the O2 sesors. Some mechanics may try to do this, as it is generally the problem on other vehicles. However, on this model Corolla, it is generally not the case.

The oil light is a low pressure warning. Either you need more oil, or a new oil pump.

Jul 03, 2008 | 2000 Toyota Corolla

Not finding what you are looking for?
2003 Toyota Corolla Logo

160 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toyota Experts


Level 3 Expert

80417 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8841 Answers

Are you a Toyota Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides