Question about 1998 Mazda Millenia

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Check engine light 1998 Mazda Millenia ( for emissionwiz)

You said worn out catalytic converter but which one, the front one closet to the firewall?

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  • am_baugh Jan 26, 2009

    Anyway,I want to thank everyone for their suggestions but I have a friend whose husband works for a Mazda dealership for over 20 years as a mechanic and he told me that it was the catalytic converter closest to the firewall. The converter was replaced by my car dealership and the check engine light hasn't came back on. I also found out that the 1998 Mazda Millenia has 3 catalyic converters.



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Check engine light usually indicates an oxygen sensor malfunction. The switch is usually installed in the side of the exhaust pipe near the engine. In the winter the wire that is connected to it often breaks off. It is usually a simple fix for a mechanic.

Posted on Jan 17, 2009


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P0134 code

Since you are asking where the O2 sensors are, you may already have the answer to this question.
Code 134 is for no activity from bank one sensor one, which is in front of the catalytic converter. The sensor would need to be tested with a scanner.

Apr 23, 2013 | 1998 Mazda Millenia

1 Answer

Check engine is flashing. Checked water level and found it very low. Added water but no coolant. Still flashing. Will lack of coolant cause Check Engine light to flash ?

No. a flashing check engine light means that there is a serious possibility that the catalytic converter is in danger of getting damaged. If you are losing coolant (and i am guessing that your engine is overheating) you most likely have a blown head gasket or a cracked cylinder head. And because of that you are getting a large quantity of coolant on the exhaust system, which can ultimately damage the catalytic converter.

May 31, 2011 | 1999 Mazda Millenia

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1998 Mazda Millenia The check engine light stays on?

Check engine light (CEL) can come on for all types of issues..from bad thermostats to lose gas caps. Flashing CEL is a real warning and it's best to pull over asap and shut it off..

It could be oxygen sensor.. catalytic converter.. the list of possible causes is long.

Many auto parts stores will scan the electronic control module to get the error code(s) that will help identify the problem(s).

It would be a good idea to call a few local part stores to see if they will do this for you.. typically for free. Dealerships can charge as much as a hundred dollars to do this.

Once you have the code you can either research it on-line or in many cases the people running the scan will be able to provide you with the solution.

The simplest thing to check is your gas cap. If worn missing or lose.. it will throw a CEL.

Best of luck

Apr 20, 2011 | 1998 Mazda Millenia

1 Answer


When the check engine light flashes this means your engine is not firing the cylinders properly and excessive fuel is in your exhaust causing damage to the catalytic converter.

Mar 08, 2010 | 2001 Mazda Millenia

2 Answers

What are codes P1492, P0421 & P0431 on the 2002 Mazda Millenia?

po421 warm up catalyst efficiency below threshhold bank 1, 431 same on bank 2..

Feb 08, 2010 | 2002 Mazda Millenia

1 Answer

The yellow engine light is on and flashing

Flashing light is bad. That means the engine is running so bad that the Catalytic Converter may be damaged. have it checked ASAP.

Oct 27, 2009 | 1997 Mazda Millenia

2 Answers

Check engine light has been on and now is flashing.(looks more like a engine/transmission pic). Car is sputterin on occasion.

When the light is flashing its indicating a problem that can cause more severe problems and should be diagnosed as soon as possible From what youve indicated it may be a misfire code which will cause catalytic converter problems 

May 08, 2009 | 2001 Mazda Millenia

2 Answers

1999 Mazda Millenia Check Engine light

it picks up nois inside of the motor it is located in the side of the block under the intake sometimes right above the starter

Feb 21, 2009 | 1998 Mazda Millenia

1 Answer

1998 Mazda Millenia check engine light

catalyst system efficiency below threshold(cylinder bank no.1).

Jan 16, 2009 | 1998 Mazda Millenia

1 Answer

Check engine light

yes the sensor and it will not go away on Mazda Millenia even though you replace that code it will show another one Mazda Millenia Sucks & Mazda Parts are Expensive too

Jan 15, 2009 | 1998 Mazda Millenia

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