Question about 2002 Kia Sportage

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How to fix check engine from showing po422 code

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The PO442 code is for a "small" leak in the EVAP system. A good starting point is to make sure your gas cap is on tight. When you install it always turn it till you hear and feel the cap click. You should also look at the top of filler neck where the cap tightens down to if its rusted or cracked this will set the code. Check the sealing rig on the gas cap also make sure its not cracked or split. If nothing is obvious there you will want to look at the vacuum lines around the gas tank you will be looking for loose lines or cracks in them. Good luck these leaks are sometimes hard to fine with all the spacial equipment they tell us it takes.

Posted on Aug 30, 2010


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If your gas cap is a screw on type inspect the o ring on the cap if it appears flattened remove it to flip it over
retighten securely
clear code
if lamp stays off for 2 days your fixed

Posted on Aug 31, 2010


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Volvo po422 code

That is an evap system leak code. There is a canister on the right rear of the car in front of the rear axle. Check the 2 hoses going to int as they crack and cause this problem

May 25, 2014 | 2000 Volvo S70

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There is a leak some where , check the lines where they have rubber on them check for cracks, the dodge is known for broken rubber boots on the end off plastic lines going to purge valve, the other problem is the top of the tank, the ring that holds pump unit in tank may have a leak.

The best way is to smoke test the system for leaks. and last is the filler neck rusts out and may have small hole

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Getting a PO422 code on my 1999 hyundai elantra the code says main catalyst sufficiency below threshold on bank # 1 and the check engine light is on.

i think it means that the catalyst converter needs either cleaning or replacing because it's not working properly because it's either blocked up or damaged. not sure which side is bank one though. the check engine light may come on for many reasons. first of all check oil level and condition of oil if it's alright the easiest thing to do is check the book that came with the car and see exactly what reasons the engine light comes on for.

Mar 14, 2011 | Hyundai Elantra Cars & Trucks

2 Answers

Hello i have a GTI its a 2.0L manual transmission, i have been having problem after problem thus far. Current engine codes PO422, PO300,PO304,PO303,PO302. I do not have a code list to see what these are...

I think that PO422 is the Cat Converter, it may be bad or may be just the O2 sensor.
The PO300, 302, 303, 304 code have to do with the ignition coils or wires. (302, 303, 304 means there are ignition /firing problems in cylinders 2, 3and 4). If your lucky just the wire and new spark plugs.
Google "engine codes Jetta" for more on web. Good luck.

Feb 06, 2011 | Volkswagen GTI Cars & Trucks

1 Answer

With a po422 code on a 2001 elantra do i replace the cat. conv. closest to the engine or the one closer to the muffler.

you have a 2001, catalict converters are guaranteed for 20-30 years. Your code respresents a problem with your Co2 sensor, probably needs to be replaced or cleaned out real good

Oct 04, 2010 | 2001 Hyundai Elantra

1 Answer

Obd codes po131 sensor circut low voltage,bank 1,sensor 1. And po422 main catalst efficiency below threshold,bank 1 came up.I wanta know how to check and fix this.

If the 02 sensor has over 70,000 on it then replace it.

If the spark plugs have over 60,000 replace them.

Make sure you have no vacuum leaks and no exhaust leaks.

If the timing belt is past its time which is 60,000 miles, replace it.

If all this checks out and you still have the cat code then the catalytic converter will need to be replaced.

Mar 06, 2010 | 1998 Volkswagen Jetta

1 Answer

PO422 PO466

u can try to unplug batt. for a few mins,if it doesnt work, erase with scanner.but if problem causing code is not fix light will come back on!

Mar 23, 2009 | 2000 Kia Sephia

2 Answers

I have two check engine lights on P0303 and P0422

A good start would be to go you the Diagnostic Trouble Codes list at

The DTC's, also known as fault codes, may have other meanings but the list above should point you in the right direction.

Hope this helps - if so a rating would be really appreciated. If is doesn't then "add a comment" instead and I will try to help you further.
Cheers D..

Jul 04, 2008 | 1999 Volkswagen Beetle

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