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Old 08-05-2016, 08:45 PM   #1 (permalink)
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Default P0420 Engine Code

I replaced the Catalytic converter and downstream oxygen sensor in an 08 Forenza for a friend. The upstream sensor had been replaced a few months earlier. He took it to a shop first, where they did a diagnostic check, and quoted him a ridiculous price to replace these 2 parts. After I replaced these 2 parts and cleared the codes, the check engine light came on after a few days. I did a diagnostic check and got the code P0420, which I am told means that it needs a converter. Well..... I just replaced the converter. Any ideas?

There are 2 things that I can think of that might be the problem:
1) The converter and O2 sensor that I used were bought on ebay, and not name brand. Could cheap parts be causing the problem?
2 ) The catalytic converter that I used is 48 state legal. We are in one of those 48 states (Pennsylvania), but I am not sure if the car could possibly be a model intended for California or New York. Could using a catalytic converter not intended for a CA or NY model casue this problem?
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Old 08-05-2016, 09:58 PM   #2 (permalink)
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It is unfortunate that changing parts based on DTC's is not reliable and most often cost $$ that were not required.

If you have a LIVE DATA SCANNER, check the O2's for switching and range..

If that is not conclusive report the Fuel trims, STFT and LTFT at idle and 2000RPM, keep at the RPM for at least 30 sec so that the ECU settles..

Note the B1S2 will mimic the B1S1 (some what), Report findings..

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Old 02-02-2017, 12:43 PM   #3 (permalink)
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My 2004 Forenza has P0420 few months ago. A new catalytic from eBay Canada was replaced and fine. The previous catalytic was a replacement part from a eBay USA store but only last for one year. This eBay store sold me the first catalytic but only last for about 6 months. The first catalytic with the car has been used more than 10 years or > 120K until the radiator failure, overheat..
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Old 02-02-2017, 05:10 PM   #4 (permalink)
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Most common cause of CAT failure is running rich, you need to check your fuel trims..

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Old 12-21-2017, 02:51 AM   #5 (permalink)
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Has the oil been changed regularly? If you neglect oil changes, the piston rings will wear, you will have visible oil getting up onto the spark plugs, and you will invalidate your catalytic converter! I know because once I let my car go over 24,000 mi. without an oil change! That was the only time I did that, but it was enough to wear the rings down ('08 Forenza which is now at 139,900 mi). Now it is also at risk of consuming oil, though I keep on top of it now.
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Old 02-10-2018, 03:59 PM   #6 (permalink)
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I found my solution in my thread. Go check it out.

https://www.suzuki-forums.com/general...converter.html
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