If you are getting a code for bank 2 cat then the problem is the dual converter Y pipe
What I have circled is the bank 2 cat which is part of the y pipe part 5F250
if i replace that do i need to change the oxygen sensors at the same time?
I would recommend the front ones
what are the codes you are getting?
What I would recommend trying first before replacing the cat is replace the front O2 sensors and see if the PCM will take a reprogram and then see if the 420 comes back before replacing the cat
what is downside if i continue to drive --car is performing great --
A lazy front O2 will also set the 420 code
The CEL will remain on and if you have to have emissions inspection in your state it will not pass
mechanic did temp check and one of the two cats was off he said
Yeah what this code telss you is just the cat is not functiong correctly.The cat is actually an oven that lights by chemical reation to burn the unbirned HC's in the exhaust
do not have emission check and is there any way to be sure it is the cat and not the sensor?
The only way to be sure is with an osiliscope
who can do that?
See what the computer is looking at is the switch ratio between the front O2 and the rear O2.If they start coming close to matching this will set a P0420 and or P0430
osiloscope test is that expensive and who can do?
Anybody that has an osiliscope and under stands how to read it could perform the test but that maybe more expensive than just replacing the sensor and trying that first.
ok can i continue to drive the car until i get that down ...what could happen if i continue to drive...the cel is out now.
Nothing would happen.This particular codes would not hurt the car at all.The only problem that would cause a problem is if the cats were stopping up then you would see a big loss in power
ok thank you
I have seen cars run for years with this code actually
ok car runs great just seems to use a little more gas
lots of power
you should be ok.I would try replacing the front O2 sensors
any idea on cost?
Hold on and I will get the dealer price for you anyway
The ford sensor $85 each and they would probably charge you an hour to hour and half to install them about $150
they have t o replace two or just one?
k thanks chuck ---just dont know what to do they want over 1000 f or the cat replacement
I would do both front ones.They are the main input for fuel control on this vehicle and if you have alot of miles on them this should improve the fuel mileage. The price would be around $300 for both replaced.
ok thanks appreciate your advice! and i will accept
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