mbz03

hi guys i have a 2003 c240 rwd with 83,000 and the check engine light came up its a p0300 i never done any maintainance except change the oil any help or advise would be awesome...

j21importer

change your spark plugs

ohlord

own a scanner?
If so clear the random misfire code and see if it comes back.
Could have been a simple miss that set the code
if returns then look at doing the plugs they are due.no multi tip
Change fuel filter
Change air filter

mbz03

yes i have a scanner and 5 codes came up
p0451
p0301
p0304
p0303
p0300 this on relates to the p0301,p0304,and p0303

mbz03

i just want to replace the right thing im pretty handy stealership charge to much money and sometimes u end up paying way to much and the problem sometimes dont go away..

mbz03

ohlord what kind of plugs should i get

ohlord

7422
inspect all emission vac lines if you clear the codes and the p0451 returns

mbz03

oh lord a change the plugs and 02 sensor but still have the codes running whats next

paulv

As ohlord recommended, check all the vacuum lines as the P0451 is an EVAP system code.

What codes do you still have?

Regards,
paul...

mbz03

i change all the plugs but all the codes are still there
p0451
p0301
p0304
p0303
p0300
how can a check the vacuum lines and which ones or where can i find a manual to see which ones they are

paulv

OK, the P0451 is the pressure sensor for the fuel tank, but tackle the other codes first. Go to Autozone and ask them if their scanner can provide freeze frame data. Freeze frame data is recorded when the CEL is set for most driveability codes. If so, get the values (they can be + or -) for the short term fuel trim (STFT) and long term fuel trim (LTFT) for both cylinder banks (e.g., LTFT1, STFT2, etc) and post them here.

If you can't resolve this problem, I know of two MB indies in the area you could go to (Wakefield and Peabody).

Regards,
paul...

jrumman

hi there
where are u from?