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Discussion Starter #1
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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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.
 

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Discussion Starter #3
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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I have the same problem. I've been putting CRC catalyst cleaner in the tank to hopefully scour out the carbon built up on bank 2 cat. No code with it in the tank. Run a tank without it I get the code within a few miles of filling up. Is this stuff actually cleaning the cats or is it simply fooling the sensor?

I saw a cool trick on YouTube where you pull the first sensor and spray Seafoam directly into the hole and allow it to soak a while, reinstall sensor, fire up, blow out the carbon and code doesn't come back. Sadly, the location of my first sensor prevents me from doing this.
 
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