That depends on your vehicle. If it was built as an OBDII compliant truck (like mine ) , it has three O2 sensors . Two are before the cat ,one at each bank , and one after the cat . Check your emission sticker on radiator to see if you have an OBD I or an OBDII truck ,or , get underneath take a look .
Beware of hip-shooters and faked experts.
2000 F-53 chassis w/ Winnebago Motor Homr built on it.
I was under my uniy last week and found the two sensors before the cat.....one in each exhaust header. BUT, I was unable to find a sensor after the Cat!!!!!!
Am I missing something or is this the norm???
Also, I may be having some cat issues so what would happen if I removed the cat and put in a straight pipe for test purposes??
Looking at solving a "misfire" issue of 5 of the 10 cylinders and wonder if my cat is plugged.
Here;s what came up on my code reader:
P0301(2); P0302(1); P0305(3); P0306(4); P0310(5).
This is a cylinder misfire (and I expect the #of events in parenthesis).
Thanks for your time.
Here is a link with good diagnostic information . Although it is for Ford 8 cyl. engine , it is mostly universal information . Your cylinder numbers ; starting from passenger side front 1 -thru 5 (5 is the back) , driver side front 6 thru 10 (10 is back) . This should put you in the right direction.
Wasn't sure if I posted any follow-up on my multiple misfire problem, so Here it is.
Driving back from Florida in March, my Winnebago Motor Home w/ a Triton V-10 (2000 Built Ford Chassis) began to 'shudder', no power, all kinds of not-so-nice things to happen when driving a big brick on the highway.
Got home OK.
Began the investigation. 5 cylinders had multiple misfires.
Short story....after looking into many possibilities, the gas seemed to be the culprit.
So, had about 1/4 tank of gas. Decided to go for a "test" run.
Maximum stress on the unit. Hooked up the tow vehicle, filled the tank with 93 oct and went for a drive, up two of the steepest hill in my area of Pa.
Had the code reader hooked up to detect any misfires.
Result: Drove 50 miles, up two big hills (max stress on the V-10) and recorded NO misfires.
Tranny shifted perfectly, engine ran like new, lots of power, etc.
I suspect that my last fill-up at a Flying J in Va. was the source of my 'bad gas'.
So, now ready for my next trip to Fla. in a couple of months.
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