Hi..mercedez benz ML-320 1999 YEA.check engine light comes and goes...codes 0300..0302..0304..cheked sperk plugs...what shoud i do..thanks

We have had check engine lights on all vehicles
for 35 years--so why the question?

Check for OBD Codes,look them up & diagnose them

hi got 2012 mercedez benz c250 i change the camshaft actuators intake and exhaust. first thing i change becouse make a lot noise when'd is cool now i put the actuators the noise is gone for two days now i got the code poo14 now is jerking and shaking ???

Hello try to measure the voltage at the glowplug wire with ignition on.

It must be at between 5 and 12 volts.
They need to be changed at 60000 to 80000 km.
Because at this mileage they are normaly burned out.
Each plug can drag 8 to 10 amps, when on.

If no reading volts, the glow plug relay, and maybe the plugs must be renewed.
There should also be a big fuse at the firewall, check that also.
Follow the glow plug wire, where it goes to.
Does the glow plug lamp light up in the dashboard ??
Are the relay clicking ???

Check also for blown fuses, resistors, or broken wires.

If you change the glowplugs, DO NOT overtighten them, not more than 15 NM !!!

Good luck

MB fault codes @ 005 "Engine coolant temperature sensor intermittent connection." It must be some loose connection somewhere. Check the fuses, relays or worse you may have a fried wiring harness, very common with MB's.

They may have added too much oil -- a 2004 MB ml350 with a 3.7L engine should take only 8.5 Quarts (including what goes in the oil filter) -- Exactly 8.5 Quarts, no more, no less. You may be able do check the oil level by using the onboard computer - pushing the buttons on the steering wheel - follow the directions in the owners manual on how to check the oil level.

its day time running lights dealer can onley turn these of in the computer

Most of the time Check engine light will come due to Gas and gas cap issues. If you ran out of gas and gas lost pressure it will bring the light on. Make sure to fill take with premium (91 octane) gas and make sure gas cap is closed completely. loose gas cap will cause the engine light to come on. If after doing this you still get the engine light warning, take to authorized mercedez deal for code check.

hello

hi,seem you have a leaking steering hose near exhaust pipe,open the hood,visual check on your steering fluid reservoir,check the lever,fine-out the leaking parts,ty

have a mechanic check the altanator but thats doubtfuly the problem unless merc. has a scensor that will stop it from getting gas