Have Jeep Questions? Ask a Jeep Repair Expert for Answers
what is your exact problem?
I need your vin the p1687 MAY be a ghost code how did you get the code? if you tried the old key cycle method it will pop many erroneous codes a code reader is the only way to get true codes
the p0420 is why the check engine light came on, that code is cat efficiency failure, which means you need cat converters, when that code pops up the ONLY fix is replace the cat converters.
the p1687 is NO CLUSTER BUS MESSAGE, that means the instrument cluster is not sending OR receiving communication messages, do the gauges all work properly?
a BUS is the communication method ALL manufacturers use to link the computers together, in a jeep the instrument cluster is a computer, your jeep has about 20 computers and they all communicate on a BUS
expensive to fix and can be difficult cost is USUALLY around 1000 for OEM replacements, including the special clamps oxygen sensors and labor, some aftermarket can be cheaper BUT you get what you pay for, many cheap aftermarket ones will reset a cat efficiency again.
ignore the p1687 it's a ghost if the gauges are all working ok
I CANNOT say since I do not know your husband, his skill level or what tools he has, I am in Connecticut and corrosion is a huge problem so torches are a requirement to remove frozen or rotted parts a full selection of air tools is usually requirement as well the transmission will need to be supported and the cross member will need to be removed as well to get the cat converters out, so the jeep will need to be put in the air enough to get under It, it's NOT a tough job but time consuming a pro can take several hours to replace them, an amateur will likely take longer.
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ask your husband if he feels confident in attempting it only he will know