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    Butch Holman's Avatar
    Butch Holman Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Apr 8, 2013, 03:30 PM
    Po520 2006 chrysler 300
    I have a 07 chrysler 300c 5.6ltr. The cel is on for fault po520. I've changed the oil, filter & sensor. I had the code cleared. But the light comes back on. Any ideas ?
    CaptainRich's Avatar
    CaptainRich Posts: 4,492, Reputation: 537
    Cars & Trucks Expert
    		  
    #2

    Apr 9, 2013, 10:25 AM
    That code indicates that the PCM isn't 'seeing' the correct engine oil pressure. This will need to be diagnosed hands-on by someone with a quality digital volt meter. There are many steps involved so this isn't recommended for the DIYer.
    I wouldn't use this vehicle until the issue is resolved since if you're actually NOT getting proper engine lubrication, damage to the engine is imminent.
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
    Uber Member
    		  
    #3

    Apr 9, 2013, 12:21 PM
    Proceeding carefully, check the oil pressure with a known good mechanical gauge. Check the engine for sludging. If there's sludge, consider Auto-RXing the engine; then, switch to full synthetic engine oil, which should eliminate sludge. If it's fine, and the engine runs okay, focus on the PCM and wiring.
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