I have a 1998 Mercedes 230 CLK . Am getting a code PO455 reocuring. Had a leaking charcoal canister and replaced it. Can anyone tell me how the ECU tests this system and at what point during operation this happens. Tank pressure sensor and purge selenoid are working. Have both charging voltage ang 7.5 volts to relief valve by canister.

SOURCE: check engine soon light. diagnosed as troble shooting codepo44

Change the evap vent solenoid canister located near the master cylinder on the right side of the engine or your hoses may be cracked. Good luck!

SOURCE: Mustang GT 4.6 EVAP Canister Purge Valve Location?

You will need to remove the right front wheel & wheel well liner. The canister purge valve is behind the cover. It should have two tube going into the bottom and one on the side near the top.
You can fix it!
If this helps you out please rate me!
Brett

SOURCE: I have a 2004 Avalanche, 49K mileage, code PO446,

That is an EVAP code. its a vent control code. you can manually test it by powering it up if you know where its at. i cant remember exaclty where its at off the top of my head but its only 2 wires. using a volt meter you want to make sure power is getting to it, but you cannot activate it without dealer scan tool.hmmm if you can figure out which is ground and power when you give it 12 volts it should click. meaning your vent solenoid works and you have wiring problems or its leaking.

EVAP problems are hard to finde with out scanners. you can change the vent solenoid and hope it fixes it. but a code points you to the direction of a problem. hopefull its not wiring problems. in the northern states with snow. ice can pull out wires and also get clogged in the vent solenoid and lock it up. its either wiring or bad or a leaking solenoid. check condition of wires. if they look good try a vent soleniod.

if that doesnt fix it after a engine light reset and 2 weeks or so. then goto dealer. you need to reset it after repair. light will not go off on its own.GOOD LUCK

Michael
ASE certified.
plz rate

SOURCE: 1999 Mercedes CLK radio antenna

look at antenna wires make sure every thing is in contact.if all is good.sound like problems in the sound amplifier.in radio.

SOURCE: my mercedes clk 320 99 wont start , i turn the

This is probably your starter.