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2013 Infinity QX56
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Discussion Starter · #1 ·
The check engine light has been coming on in our 2013 Infinity QX56. Our mechanic was able to clear the light for awhile by running fuel injector cleaner in the gas which lasted for four months. The light was back so we replaced the O2 sensors and added some injector cleaner to the gas. The light is back on and we are hoping the injector cleaner helps but our mechanic said the code reads a bad left side cat. Does anyone know if the cheaper aftermarket converters are any good? It looks like a factory converter runs around $1K compared to $300-$400 for an aftermarket manifold with cat. Should we replace both converters at the same time?

Thanks in advance!
 

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Discussion Starter · #3 ·
What's the code being thrown? What's the purpose of the vehicle? (Daily driver / Highway / Offroad?
I’m not sure of the exact code our mechanic just said it indicated a bad drivers side converter. The vehicle is my wife’s daily driver/ kid bus.
 

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If the code p0430/p0420 your cats are failing and more than likely going to have to be replaced. If your mechanic can see your fuel trims, have him check them. The armada fuel pumps are know to go out when the vehicle is run on empty consistently. From my experience it gets enough fuel at 2,000 rpms but start to starve of fuel above that rpm range, causing it to run lean and excessive heat on the cats. if that's the case you might be able to prolong the life of the cats.
 

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Discussion Starter · #7 ·
Thanks for everyone's input. After the O2 sensor replacements I was getting P0430 and P00087 codes. The mechanic replaced the low side fuel pump along with the fuel filter. The filter had some debris. This seemed to fix a slight hesitation that occurred at steady low speeds. We'll see if the light comes back on but I'm guessing vwchisme may be correct in that the fuel pump may have caused a lean condition leading to the the cat failure.
 

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Thanks for everyone's input. After the O2 sensor replacements I was getting P0430 and P00087 codes. The mechanic replaced the low side fuel pump along with the fuel filter. The filter had some debris. This seemed to fix a slight hesitation that occurred at steady low speeds. We'll see if the light comes back on but I'm guessing vwchisme may be correct in that the fuel pump may have caused a lean condition leading to the the cat failure.
Hopefully you caught it in time and it resolves the codes. I'm on my second set of headers, went with Cajun Bpipes this time. During the tuning process that's when it was noticed the fuel trim at higher RPM's was an issue. This was the 2nd fuel pump i've switch out, lifetime warranty with Auto Zone. Plan on replacing it every couple years for peace of mind.
 

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Thanks for everyone's input. After the O2 sensor replacements I was getting P0430 and P00087 codes. The mechanic replaced the low side fuel pump along with the fuel filter. The filter had some debris. This seemed to fix a slight hesitation that occurred at steady low speeds. We'll see if the light comes back on but I'm guessing vwchisme may be correct in that the fuel pump may have caused a lean condition leading to the the cat failure.
I hope your mechanic realizes he's dealing with a Z62 QX80 that utilizes TWO fuel pumps; low pressure (in-tank) and a high pressure fuel pump. I say that because a P0087 DTC/Low Fuel Pressure, actually means low pressure readings from the high pressure fuel pump and not the in-tank fuel pump your mechanic replaced.
 
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