Howdy folks,
This post is for new owners of used CRDs who may learn from my initial trials with an otherwise great Jeep. I bought a used 2006 Liberty 2.8 CRD and the first thing I looked at doing past an oil change and K&N filter swap was the glow plugs - I had heard about the tendency of the Bosch ceramic ones breaking. The engine light was on so I pulled the codes and ended up with the four in the subject line. For those that don't know, these are codes indicating voltage inconsistency to the glow plugs - and each code indicates the respective cylinder (P1261 = cyl. one, P1263 = cyl. 2, P1265 = cyl. 3, P1267 = cyl. 4). Having bought this truck used I suspected the wrong plugs as I also knew some trucks had been converted by the dealer away from the stock 7V system to a 5V system (dealer can often trace the upgrade if it is performed - I was fortunate the truck was one owner as the dealers maintain records specific to the repairs or modifications they made and not all authorized dealers, surprisingly). I quickly found out how hidden the glow plugs are - removal of the alternator bracket is necessary to reach cylinders 1 and 2, removal of the EGR pipe for cylinders 3 and 4 (note that the gasket for the pipe as it mates up to the intake is P/N 05066946AA and still available online for around $20 after shipping - noticed some folks using RTV but I chose to order it for cleaner removal down the road.) I also learned that the plug in cylinder 1 was a 5v Bosch plug with a red band around the back (not that you could easily see such band anyhow - the plug is stamped after you remove it and easily readable). I ordered some 7v Etechno1 plugs (steel) to replace the old ones which turned out to be in surprisingly good condition on cylinders 1 and 2 (I found out why later and here's where it gets interesting to other noob CRD owners with these codes). Replacement of the plugs in 1 and 2 eliminated codes P1261 and P1263 - leaving only the faults in the two rear cylinders ... the clear conclusion was that the previous owner had replaced the plugs with the incorrect 5v Bosch ceramic ones, causing a low voltage condition to its respective controller. If other new owners have all four codes and no others showing, there may be a strong likelihood that the wrong ones were installed as they are apparently more readily available in hot climates such as Texas where I live. Hope this helps someone else and its great to be a member of such a useful forum for this great and somewhat uncommon Jeep!
Cheers
