Question about 1999 Mazda MX-5 Miata

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Check engine light

The first time the light came on the code was o-2 sensors. ireplaced both.the light came on again,thistime the code was cat converter.replaced my cat converter.the light is on again .same code cat converter

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Did you ask the dealer if the car an an emissions recall for this problem

Posted on Nov 13, 2008

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Good afternoon..... I've been on here before My question is this.....I have a 2006 nissan altima 2.5s and the check engine light us on .....I replaced the O2 sensor by the cat. And u cleared the code and...


bank 1 sensor 2 is not the upper sensor, it is behind the cat converter, replace it, disconnect the battery and go drive it to somewhere to have the codes cleared. It will relearn the fuel table to run properly

Aug 10, 2014 | Cars & Trucks

2 Answers

P0407 bank 2 code check engine light on


i would start with o2 sensor that's after the cat and clear code! if still not good then move to the next one till you have it right!

Mar 10, 2013 | Cars & Trucks

1 Answer

P0421 warm up catalyst...below threshold (bank 1).. 1st of all, what is BANK 1 and is P0421specific to the problem or it is just a general code for cat converter or oxygen sensor


A v-6 or v-8 engine will have two banks. Bank one is the side of the engine with the number 1 cylinder. Bank 2 is the other side of the engine. In your case Bank 1 is cylinders 1-3-5 on the back side of the engine closest to the firewall. Bank 2 is cylinders 2-4-6 on the other side of the engine.

You have two cats bank 1 and bank 2. There are two oxygen sensors before each cat that help determine fuel trim and are refered to as sensor 1 and two oxygen sensors after the cats that monitor cat efficiency and are referred to as sensor 2. The bank 1 sensor 2 O2 sensor is either providing a higher than expected signal or is switching like the sensor 1 O2's. If either of these has occurred the PCM detects that the cat is no longer working as it should and sets the code/turns on the check engine light.

9 times out of 10 it is a cat that has gone bad.

Nov 16, 2010 | 2002 Mitsubishi Galant

1 Answer

2000 E-350 V-10. P0174 with exhaust fix


Before I even finished reading this i knew you had a clogged cat. If you have fixed everything you mentioned i would lean towards a clogged cat. This is a large reason this code pops up.

To check this you could pull that cat out and drive around and see if the code comes back, make sure to stay away from the police though.

Subikid90

Mar 03, 2010 | 2000 Ford Econoline

2 Answers

2004 Range rover Check Engine Light


The Range Rover actually has 4 oxygen sensors - 2 in front of the Cat and 2 behind the cat - try to check / replace the other 2

Dec 21, 2009 | 2004 Land Rover Range Rover

2 Answers

Where is the O2 Sensor located on 2003 Ford Focus? Check Engine Light is on and trouble shooter device says the problem is in the O2 Sensor Heater Circuit, but where is it located.


The code will tell you which O2 sensor it is.
The code will point to either bank 1 sensor 1; bank 1 sensor 2; bank 2 sensor 1; bank 2 sensor 2.

From what I remember with a focus, it should only have 2 sensors, sensor 1 will be located before the cat, and sensor 2 will be located after the cat.

Oct 08, 2009 | 2003 Ford Focus

1 Answer

Engine light was on and engine idles rough.


these O2 sensors are cat convertor check sensors. id be checking cat convertors and hopefully you should try replacing if not all ready is the front bank 2, O2 sensor
if you have scanner can you see fuel trims in data display to confirm high fuel trim only on bank 2 either +-5 or more indicates problem and if bank 2 sensor 2 has fixed high 700mv reading cat no good(warm idling)

Jul 10, 2009 | 1998 Isuzu Rodeo

1 Answer

Check Engine light on!!!!!


its the O2 sensor for sure. normally, its good practice to change the sensor when changing out the muffler and cat system. doing it all together will prevent the sensor from faulting.

Mar 11, 2009 | 1997 Honda Accord

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The code PO420 came on for my 2000 Toyota Camray ......


Catalyst Effeciancy below threshold (Bank 1) is the code meaning. Check or replace the oxygen sensors. Some cars have 2 .One is on the front of the cat. the other is the on the back. Check the back sensor . Other possible causes are leaking or damaged exhaust manifold, bad coolant temp sensor.If toyota did not replace both . replace the one on the back of the Caty.

Feb 02, 2009 | 2003 Toyota Corolla

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O2 Sensor Bank 1 Sensor 2


That is the O2 sensor right behind the cat. converter. When the cat is clogged it can shoot contaminates in the O2 sensor so sometime just cleaning the sensor will make it work again, if not it will need to be replaced. Mark - ABKS

Oct 02, 2008 | 2001 Dodge Neon

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