I have a 2000 Ford Expedition with 157,000 miles. Do I need to be concerned about replacing the timing chain?

A very nice comfortable automobile:) No concerns with timing belts...no other major concerns...they hold resale value well don't they:) At 89,000 miles you early maintenance concerns will be have the brakes been replaced...have the front rear struts been replaced? Tranny fluid filter serviced yet? Also should replace plugs and wires by 100,000, also look at wear on serpentine belt...coolant serviced? These are minor concerns, but will definitely affect your enjoyment of this premium Buick:)

If the codes were not there before then your chain alignment is off for sure.

Distributor and distributor cap and rotor all new and new wires also .

Couple Days

No engine used in the Expedition has a timing belt, they all have timing chains, timing chains never have to be replaced unless they fail or the engine is being rebuilt. On this engine replacing the timing chains for each of the two camshafts (2) cost about $500.00

If your car has a chain there is not a scheduled replacement. A timing chain should last as long as the engine. No need to replace the chain. Now things can happen such as a guide wearing out or a drive / driven gear wears out, then a chain should be replaced. You do not need to replace a chain under normal usage. *** Now the 2000 - 2004 Escape with a 2.0L (4 cylinder) does have a BELT and yes, belts should be changed (Ford recommends) every 60,000 miles or 7 years which ever comes first.

It's a timing chain... They will probably last for as long as the vehicle does (175k-200k miles depending on upkeep and willingness to keep the dog alive). That said, if there's a reason to have the timing chain cover off an engine over 100k... I'm the type that would go ahead and replace the timing chain while it's in front of you if you plan on having the vehicle for more than a year or so.

If you have the engine pulled for any reason over 100k, then that's another time that I'd be replacing the timing chain and the oil pump while I'm at it...

yes I would due engine. heck for $2,200 dollars I could do the job parts labor and all

first how many miles does the expo has? then have you change your oil lately and what weigth oil do you use. if it has high mileage
make sure to use a thicker weigth oil, this will eliminate some of your tapping. there is two things that you may be hearing tapp.
one is a or the lifters. two it could be the timing chain that needs '
replacing its a common problem on the newer ford,s.