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MARIO
MARIO 8/6/2010
1996 Mercedes Benz C220 Base 4Cyl2.2L - Engine
Why am I still getting error code P1444 after replacing purge valve with a genuine Mercedes part for a C220 model?
Error code P1444 was read by my mechanic. I bought the part and installed it myself, erased the code, yet after about 10 miles of driving the engine light comes back and the same code comes up. Is there something that I can do?
4 Answers
  • HouseCallAuto
    HouseCallAuto 8/7/2010
    Codes do not come up immediately because the computer uses two trip detection logic meaning if it sees the same malfunction in two consecutive drive cycles it turns the light on and / or sets the code. It is never immediately. The valve you replaced under the washer tank is the switch over valve although you referred to it as the "purge valve". There is another valve called a "purge valve" as I see it in schematics but have no location for it. Check the wire circuit as I described for that valve above in previous answer.
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    HouseCallAuto
    MARIO 8/9/2010
    When I installed the valve, I pushed it down to insert the rubber handle in the metal slot not realizing that underneath of it there were couple of metal pipes. Making a contact, the valve was creating an electrical short. I pulled it up and so far so good, I dtested it driving about 26 miles without the check eng light comming back on again. Thanks for everything.
  • vince^_^
    vince^_^ 8/6/2010
    Check the condition of your vacuum and hoses, it may have a leak.

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    vince^_^
    MARIO 8/6/2010
    If there was a leak, wouldn't the check engine light come on immediately rather than after diving 10 miles? Is the same code. Can the new part be bad? Anything else?
  • MARIO
    MARIO 8/6/2010
    If there was a leak, wouldn't the check engine light come on immediately rather than after diving 10 miles? Is the same code. Can the new part be bad? Anything else?
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    0
  • HouseCallAuto
    HouseCallAuto 8/6/2010
    Seems there is another part called a purge-flow switch over valve that could also be bad. It is connected indirectly to the purge valve which you changed already. I have no specific knowledge of MB diagnostics of this specific system but after reviewing a schematic my advice would be to check the electrical connections to these two valves. Specifically, the purge valve that you replaced has two wires and the black / yellow should have battery voltage with key on. If not, check fuse #30 (15 amp). The other wire is for the computer to turn the purge valve on (computer sends a ground - and this ground will only be present when the valve is called upon to function)
    The other valve (which you did not consider) is the purge flow switch-over valve. Most likely a bad valve OR a broken vacuum line at the valve. Valve is located UNDER the w/s washer reservoir.
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    HouseCallAuto
    MARIO 8/7/2010
    Both,my mechanic,after he point out the purge switch over valve,and I, felt it clicking.This is the valve that I replaced.It is down by the w/s washer reservoir.Still getting the same code.I am reasoning out that if I had either the front or the back hoses broken and therefore a leak,that the check engine light will come up immediately and not wait until 10 miles of driving.From internet,I found Code error P1444 also to apply to "left CAT temperature sensor (B16/4)".Any suggestions?Thanks to all
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