P0430 Ford Code - Catalyst System Efficiency Below Threshold Bank 2

I recently degreased my motor on my 01 crown vic, then I rinsed it off, after I was done, I started it up and it was idling crappy, so I drove it around for a bit to dry it out and while I was driving the check engine light came on so I took it to Autozone to pull the code and while the guy pulled the code I told him what I did and how it was running and he said I got the cylinders wet, so he told me to just continue to drive it and it will dry out and to disconnect the battery to reset the code so I did that. I drove it for about 3 days and on the 3rd day the check engine light came back on but the car doesn't run bad, and the code that originally came up was P0430. So im wondering if its an O2 sensor or 1 one the cats. Does anyone have any ideas, or should I just replace the plugs and the O2 sensors. I cant fine a vacuum leak or hear one and that was one of the possible things that it could be but not sure. So any ideas or help would be great. Im sure there are more crown vic owners out there that have had this problem. I honestly think I know what to do but I am hoping some one else has a more inexpensive idea for me to try.

You should start by checking the sensor connectors. Unfortunately never seen that problem before, but corrosion on the sensor connector could cause a bad O2 sensor reading.

I have a 2005 Ford Expedition that was having power issues, wouldn't accelerate, etc. We replaced all coil packs which seemed to help temporarily but, I am now getting the following codes P0191, P0420, P0430.

Are any driveability problem right now? When there is a problem with the ignition coils, raw unburned gas goes directly to the catalytic converters. Sometimes that unburned gas will damage the cats, but sometimes it may just temporarily trigger the P0420 and P0430 but then the codes go away. If no driveability problems are present, you should just try to drive you Expedition for a couple of days and then clear the code.

power issues. like everything shifts fine with light acceleration but stays high rpm and long shifts when really romping on it? It would definitely be a plugged CAT

Our police explorer c u v' s are chronically having the cat converters replaced, I believe the constant idling and driving them 24 hrs a day are clogging them up. We seem to be replacing two sets of them before we take them out of service, they are warrantied up to 80,000 miles. Their engineers need to rethink the cat system as they are whoafully inadequate for police department use.

hi everyone... I have a 2013 Ford Explorer XLT Mexico version and it has check engine fail and the scanner result was this code P0430. The car drives normally whit low speed and low rpm BUT when i drive with more power, the car starts to fail and starts losing power. I just need to replace the catalytic converters to fix this problem? Thanks for your comments

Yes, the catalytic converter came apart and during hard acceleration the pieces of the catalytic converter blocks the exhaust. If you don't mind the engine light and don't have to do an smog check, then you don't have to replace the catalytic converters, just clean.

2007 ford explorer sport trac.engine light came on.during a trip lost some power,struggles to get up to 60.
15 minutes later it quits.light still on

Sounds like you may have a clogged catalytic converter. The first thing I recommend to do is removing the catalytic converter and check if it is coming apart.

Hi, I have a Taurus 2014, code P0430 came out around 2017 and I went to a few workshops and in the end had to replace the catalytic converters. it was a very expensive repair, car had 64k miles on it. driving is normal and mostly highways.

I asked them to check O2 sensors first but they said it was the catalytic converters. I had no issue with power, car drove normal, low or high speeds and accelerates fine.

Now, around 6 months ago, same code came back. I am not sure what to do. the first repair was done at Ford agency so they are supposed to be the experts! Same description, just the code with no loss of power. BTW, car passed emission test with the code on ( not in the US, so it might not be very accurate).

How should I go about the issue? Lets just assume that all workshops are dumba**es and I have to diagnose the issue myself.

Car is being maintained regularly, spark plugs replacement as per maintenance schedule.

What type of gas are you using? the main reason for premature Catalytic Converters failure is the is gas. Low octane or bad gas could cause a a premature failure. I recommend using high octane and/or using a fuel additive before replacing any other parts.

91, we only have 91 and 95 here, and I was advised to use 91 by the dealership.
I did use fuel additive and cleaned up the injectors a couple of months ago (problem was there already). I am going to try and replace the O2 sensors first and clean up the catalytic with LIQUIMOLY and see what happens, maybe that will solve it. I mean if there was something wrong with the engine and it is passing unburnt gas into the catalytic, I would know from loss of power or something, maybe even the exhaust would make some loud noises.

I used 95 a long time ago for a little while but stopped. where I work, we have a fleet of Taurus cars and they all use the same fuel, 91. no issues there.

I would try the Liquimoly first and then the O2 sensors. Another symptom of unburnt gas going through the engine is black smog. Try monitoring that as well.

my CEL comes on sporadically and PO430 pops up on my scanner. doesnt act like a vacuum leak in terms of sputtering at low idle or such. could it be an O2 sensor?

01 crown victoria p71 btw

Unfortunately, the problem is more than likely the Catalyst Converter. Since the code is not consistent, you could try using high octane gas and/or a fuel additive for a couple of weeks to see if that make any difference.

Ihave a V6 2012 mustang p0430 and p013a came out after installing a universal magnaflow cat converter

The codes may the results of the catalytic converter was not properly installed, the converter is not compatible with your vehicle or the rear oxygen sensor was damage during the installation. You should take it back to the shop that installed the converter for you.

To day my to the shop that installed the the converter and i found an exhaust leak from 2 side after fixing it and clear the code , check engine on again but this time p0430 only

Unfortunately, other than the catalytic converter I have not seen any other component causing the P0430 code. It's possible that the catalytic converter that was installed is not compatible with your vehicle.

HEllo there I have a 07 ford taurus and me not being a mechanic guy I went to walmart and bought a small cheap scanner and gave me a 0430 code with P0300 also . I did notice the o2 sensor between the engine and firewall has been melted with the exhaust so it melted the plugs in one solid unit with pins expose could that cause the code 0430 and misfire to happen.? Car run ok but at red light the rpm does surge . Also I put 91 octane with a HEET additive to tank and car runs better with minimum surge. Any advice will be awesome of u to give me and I'll be grateful. Thinking on replacing the o2 sensor bank 2 new since its melted also the MaF sensor. The things I replaced so far is *Spark plugs/wires *fuel filter *coil pack *water pump *tps

Forgot to mention I live in california and car has 271,064miles and drove to Houston texas and back then it gave me that issue bought the car 1 1/2 years ago with 225,000miles

Replacing the O2 sensor is the best start, not only for the melting wires but also for your vehicle's age. Once you have replaced the sensor, clear the code and check what code comes back first.

By "By clean" are u referring to making the Cat hollow from the inside in other words break the honeycomb type thing

Yes, make the cat hollow and remove the honeycomb material. Keep in mind that the engine light will stay ON and that your vehicle will fail the smog test.

I had that code on our 2013 for edge, and I took my mid range scan tool out and checked then cleared the code, drove the car for few minutes and it did not light up again. can this code happen by happen chance aif it is stop and go driving. My wife drives it and she is a PSW who does Home care in the community, and she saw it on after getting gas, and she never fills the tank full

can this code happen by happen chance aif it is stop and go driving

It's possible, but not common. The code could set if you use low octane gas. Try using high octane gas, add a fuel cleaner if possible, and drive some highway mileage to clear the Catalytic Converter.

Have a 2016 explorer n/a 3.5l v6, have p0430 code also, i've replaced the catalytic converter and also replaced both sensors, car runs perfectly fine, always has since the light showed up, dealer seems to think its a "exhaust leak" which it is not, if it was, it would be very noticeable, tried clearing code but its now a pdtc and wont clear...vehicle has 94,000 miles....any ideas?...also factory claims that they are not responsible for the "converter" even though they are responsible...under the extended factory warranty...to replace "exhaust manifold"...because ford changed the name of the "manifold" to a "catalyst"...imagine that, dont take responsiblilty for an obviously very common issue

plugs: motorcraft platinums (replaced july last year)
catlytic converter: replaced a week ago...(not motorcraft brand)
no intake manifold leak
no noticeable misfire
coils are original to car
no noticeably bad fuel mileage

2009 ford mustang v 6 Getting fault coeds P0135 P0141 P0155 P0161 P0403 and P0443 I clear the codes. And by the 3rd or 4th time starting the car i get these same codes back. I have replaced the EGR Valve the EVAP valve engine side and fuel tank . Also replaced Front o2 sensors left and right . Next repair going to drive off a cliff. please help