Help with a P0430 code - Infiniti FX Forum : FX35, FX45 and FX50 Forums
 
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post #1 of 3 (permalink) Old 05-07-2019, 01:12 AM Thread Starter
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Help with a P0430 code

Hello everyone, hoping someone can help me out with this or at least point me in the right direction.

For a few weeks now my mpg has been solid at 16.4mpg no matter how gingerly or aggressive I drive it. I knew something was up but as it didn't throw a code the only thing I could do was change the spark plugs and air filter. For a few days mpgs shot up to 21 but soon settled at 16.4 again.

With this came an exhaust smell as if it was running rich and a slight vibration at idle. Today on the way home the engine light finally came on giving me the very vague code of P0430. From my understanding it could be 1 of about 10 things.

My tags and smog are due in 2 months so time is not my friend. Any help is greatly appreciated.

Car info:

2004 Fx35
78450miles
Completely stock
Month old Air filter
Oil changed a month ago(old oil looked good)

Symptoms:

vibration at idle
Poor mpg (16.4mpg)
Smell from tailpipe
Code P0430
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post #2 of 3 (permalink) Old 05-07-2019, 06:47 AM
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This could be a number of things. P0430 (or P0420) normally indicate a Cat that is not working as efficiently as it should. However, it could be an O2 sensor, MAF, vacuum leak. Since it seemed to happen shortly after you changed the air filter, check to see if the MAF got disconnected.

2009 FX50 with Tech package
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post #3 of 3 (permalink) Old 05-07-2019, 06:21 PM Thread Starter
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Just checked and maf seams fine.

If it does come down to having to replace the cat and the sensors where is a good place to purchase them from. My local auto zone only sells universal cats and all their online stuff says not for sale in California.
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