P0430 MIL error with EGR disabled - Jeep Garage - Jeep Forum

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Old 11-16-2014, 10:39 AM
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P0430 MIL error with EGR disabled

I have a 5.7 Hemi with 147,000 km. A few weeks ago I installed a custom performance tune, which has EGR disabled; the car has never felt better to drive. Prior to this I would get an occasional P0430 MIL error, which I would reset with my scanner. Since disabling EGR I am rarely getting beyond 50 km before the error comes in. I am assuming that the disabled EGR is making an already ‘worn’ catalytic converter work harder, but was wondering if someone could confirm this before I go and get this replaced. Also, if I had a partially stuck open EGR valve would this cause this problem. Thanks in advance for any advice.

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Old 12-09-2014, 10:05 PM
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Re: P0430 MIL error with EGR disabled

It is my understanding that EGR is there to "taint" the air/fuel mixture to reduce the formation of Nitrogen Oxides that can't be converted by the converter. This would indicate that the EGR won't impact the converter. However the oxygen sensors, particularly the downstream ones, can make the computer "think" the converter is not working. A stuck open EGR would act like a vacuum leak. My 2 cents...


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Old 12-11-2014, 03:41 PM
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Re: P0430 MIL error with EGR disabled

The EGR system reduces the combustion temperatures, which reduces the occurrence of NOX. It also allows for more timing to be run, because it reduces the incidence knock retard. My Hemi is moderately modified (see signature) and I would never think of disabling the EGR system for the reasons above. Also, if you're in an emissions testing state, the smog nazis will be glad to see you. The other changes to your tune probably made the driveability better. The stock everything (PCM/TCM) settings are crap, IMO, and almost any change would be for the better.

Your P0430 is usually caused by an exhaust leak (I'd check this first), a bad downstream O2 Sensor or a bad catalytic converter. Do you have a way to check/data log all the O2 Sensor Mv readings? That would be the easist way to check their status.

So, I'd look for exhaust leaks first.....especially broken bolts at the exhaust manifolds or leaks at the manifold/Y pipe connection. If all is OK there, I'd try to get the Mv readings off the O2's. If both of the above are good, then take a look at the cat. My $$$ would be on a leak and/or lazy/bad O2 Sensor.
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Old 12-18-2014, 03:25 AM
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Re: P0430 MIL error with EGR disabled

Looks this was a bad O2 sensor, I replaced the bank 2 sensor pair (upstream & downstream) and the problem has not recurred
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