Easy Any of these DIY/inexpensive part replacements worth it?

[golden1245]

Hey guys, I've narrowed down a few things that I wanted to replace since I've heard that they are cheap and easy to DIY and also brings back some lost performance and prevents other issues. Currently my '99 C230K is running decent for a 151,000 mile car. A new transmission mount is being put in next week.

I also wanted to change:

MAF Sensor (it's been 120,000 miles sinse it was changed)
Crank Position Sensor (heard it's easy diy and gives smoother starts)
Fuel Filter (hasn't been changed in over 80,000 i'd say)
Knock Sensor (heard it's easy diy and gives smoothness at high revs)
Front 02 Sensor (Original sensors i think...will increase fuel economy and prevents Cats getting too hot)
Fuel Pressure Regulator (gas lid doesn't make a hissing noise anymore, might increase fuel economy. I'm currently getting about 20 mpg with spirited driving)

All of that would total $400.00 for parts. Are there any items in there is not worth changing if there is nothing wrong with the car?

Thank you very much in advance for reading. I appreciate it

 

[mattc]

Change the fuel filter, leave the rest alone until they go wrong.

I understand the concept of preventative maintenance but many of those parts will keep working for a long time so leave well alone would be my 2p's worth

 

[Dec]

Failure of the boot lock or door lock to open via the emergency key blade can lead to great difficulties should a central locking component or battery or remote control ever fail.
Also, failure to lubricate the wiper mechanism regularly can lead to catastrophic failure of the mechanism, so , don’t delay, check these items to-day!
Maintenance viper on a Mercedes R129 - YouTube

Dec

 

[martyz]

^+1,changing a fuel pressure regulator will not alter tank pressure,it maintains pressure from the fuel pump to the fuel rail,cps will work or not or fail when hot,if emissions are ok so is o2 sensor,faulty MAF will give flat spots/power loss,knock sensor is a timing trim for pre detonation,if you want to spend money,go the plugs/leads/filters/oil route

 

[grober]

You might want change the autotransmission fluid+filter if it hasn't been changed and check the differential oil level. Front poly V drive belts are often neglected. Big precautionary maintenance item on a car that age might be a new radiator if you have an auto transmission= Better cooling and prevents possible corrosion of the transmission heat exchanger coil in the radiator leading to contamination of the transmission fluid.
ps this internal corrosion is very dependent on how well the coolant/antifreeze mix has been maintained---- regular changes maintains anti corrosion additives.

 

[moonloops]

Take it to a garage with one of those fuel system cleaner things like this:

TerraClean

Should restore a bit of pep and ensure your emissions are kept in check.

 

[golden1245]

Thanks for the advice, I actually had TerraClean run through my system about 3,000 miles ago so it's good. I also had a partial transmission change and diff fluid change, so that is good too. Radiator and fluid was replaced in an accident so it's only 40,000 miles old.

Like i said, the engine is running well, a bit loud on start ups though. Just wondering if it could run even better with those simple changes I listed. So i guess the consensus is to just change the fuel filter and the rest alone until they need replacing or throw a code? I don't feel like there's any flat spots in power...but since the MAF is so old, should I change it anyways? or no

@ Martyz: What are "leads"? Are they the ignition coils? I don't think i've had those replaced for a long time. I did have my spark plugs changed about 20,000 miles ago.

 

[martyz]

Plug leads ,from coil packs to plugs,again if coil packs are ok then no need for replacement.
If you want to change your MAF fine,but if it works why replace?

Regards martyz

 

[grober]

If you replace the MAF don't be tempted to buy a cheap knock off on EBAY- lots of counterfeit ones around also. They tend to last only months- if its cheap its a copy. Best to purchase one from MB or legit motor factor BOSCH or Pierburg