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mikkhh

Four years old only 130 000 miles. Had lots of issues since it got 2-3 years old - scr efficiency faults, dpf faults (outlet pressure data erratic). Has been to dealer, cans have been baked, taken off, new nOX sensors etc etc. Those things cured faults for some time and all faults came back and check engine light was almost always on until...

I got to it, pulled intake temp sensor, MAP sensor (completely plugged full of soot). Intake looks like a really hard one to clean out all the soot and carbon, most likely it needs head off, unless those plugs at side of the head are not for coolant then intake can be walnut shell blasted while the valves are closed. Going to replace dpf injector, MAP sensor, exhaust back pressure sensor and dpf differential pressure sensor. Also EGR is coming off, the cooler is going to get either replaced or at least properly cleaned.

Going to check the cost of brand new OEM head, 4cylinder tier 4045 deere head was around 2k brand new OEM... Maybe the head is not expensive and it would make sense to replace it and forget about cleaning woes and also head getting cracked down the line after a few years, judging by other makes and also MX13 does not seem to have a good reputation either ways. Running it as is not a good idea at all since the intake clogging is not even at all air passageways and therefore I am afraid that some of cylinders are most likely running hotter than others due to more air being present. That can lead to pistons cracking and melting, have seen it on light duty 2017+ Ranger pick up trucks. Going to at least have a look at intake air passageways with boroscope. Better to be safe than sorry and overreact on diagnosis instead of replacing an engine.

Also going to check the camshafts for wear since it had low fuel pressure fault stored, those things are known for cam issues sadly, even though it is older than two years factory goodwill is most likely going to pay for parts since it has all service records at dealer.