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2001 Isuzu Trooper LS: Trac..egr Valve..4 o2 sensors..started running

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I have a 2001 Isuzu...
I have a 2001 Isuzu Trooper LS Trac on Demand 3.5. Last month I replaced the EGR Valve, the 4 O2 sensors on the exhaust system. It started running better afterwards. Now it is running rough again and I'm getting codes P0420, and P0300 codes.
Submitted: 6 years ago.Category: Car
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7/1/2011
Auto Mechanic: Dan, Technician replied 6 years ago
Dan
Dan, Technician
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P0420 usually means the catalytic converter has failed and if its clogged it can cause vehicle to run rough, P0300 code, oxygen sensoor codes, and egr codes...You can remove oxygen sensor before converter to see if it runs better or install pressure guage, pressure shouldnt go over a few psi whiel reving engine.

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Customer reply replied 6 years ago
It dose'nt run rough until I have driven at least 15 to 20 miles. On short trips less than 15 miles it runs smooth with no problems.
Auto Mechanic: Dan, Technician replied 6 years ago
P0420 is caused by a converter 95% of the time...otherwise it can be caused by oxygen sensors which you already replaced, exhauast leak, or intake leak...So you can start by looking for leaks and also make sure fuel pressure is good...If fuel pressure drops replace filter if still low replace pump.
Dan
Dan, Technician
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Customer reply replied 6 years ago

could it be that the O2 sensors are not working properly. Or that I'm using gas that has ethonal in it. I put gas in it the past few days and i'm not having the problem right now.

I think it could just be a O2 sensor that I bought that is not working. I could not find any leaks in the manifold or exhaust system. I replaced the fuel filter last year.

Auto Mechanic: Dan, Technician replied 6 years ago
Its not a E85 vehicle so I'd assume the gas is the problem.....If issue is gone I wouldnt worry about it for now. Let me know if you run into questions, thanks.
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