What does error code 202 on JD 4720 mean?

[Jldiii]

Yesterday when clipping grass, the warning light on my JD 4720 with cab lit up. Error code 202 was listed on the console info center. I didn't notice any change in the function of the tractor or the clipper. I turned the tractor off for several minutes, then restarted it. The warning light and error code were gone so I resumed mowing. After 5 to 10 minutes it happened again. I went thru this sequence 3 or 4 times and the warning light kept coming on. Not knowing if this was a major malfunction, I decided to just drive the tractor back to the barn and call it a day. I talked to my local dealer, but they didn't know what error code 202 was. I also called corporate John Deere and they were of no help (a very frustrating experience with customer support, but that is a story for another day).

I came across this forum when searching the Internet for an answer. It sounded like something I was interested in joining. I am hoping that someone on this vast forum knows what this error code means.

 

[Henri88]

I'm sure someone with more experience on these models then I will chime in soon. In the meantime, welcome to TBN. :welcome:

 

[arlen4720]

That error means that the intake air temp is out of range. Your Intake air temperature sensor could be bad. That should fall under the 5 year emission component warranty.

 

[murphy1244]

That error means that the intake air temp is out of range. Your Intake air temperature sensor could be bad. That should fall under the 5 year emission component warranty.

Clogged radiator screen?

 

[arlen4720]

Clogged radiator screen?

Good idea...it could be something like that. That 202 error has maybe 5 "subsets". I don't know if you can drill down further somehow with the display, or if the dealer will have to plug in to get the sub codes. I'm attaching the page from the tech manual. I will dig in to it a little more later.

 

[Jldiii]

Good idea...it could be something like that. That 202 error has maybe 5 "subsets". I don't know if you can drill down further somehow with the display, or if the dealer will have to plug in to get the sub codes. I'm attaching the page from the tech manual. I will dig in to it a little more later.

Thank you for the replys and all the good information. The radiators are clean, as I have already found out on this model that I must frequently clean the grill and stacked radiators. Especially thank you for the link to the tech manual page which clearly refers to this error code. So my next question is: (1). Is there just a sensor on the manifold that may be defective? If so, is this something I can change out or do I need to haul the tractor to the dealer? If it is a serviceable item by me, where is it located? (May be arlen4720 has a schematic showing it). (2). Or does this error code mean there may be a deeper more severe problem on this tractor that only has 200 hours?

I have only been a member on this forum for 2 days, but I am already impressed by the knowledge here. Thanks again for all the help.

 

[arlen4720]

How old is the tractor? There is a 5 year warranty on all the emission components. I would let the dealer deal with it. I don't have a tech manual for the engine, so I don't know where it's located. I'm sure someone here can tell us though. Once we know your particular vintage, we can decide what to do.