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    Thread: Code 400c

    1. #1
      Junior Member
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      Code 400c

      Volvo DTC ECM-400C

      The diagnostic trouble*code*(DTC) is stored if the efficiency of the three-way catalytic converter (TWC) deviates too much. The diagnostic trouble*code*(DTC) is diagnosed when driving under specific driving conditions. ... Damaged catalytic converter.

      Anyone experience this and what wss done to remedy this problem of engine light staying on as a result of this problem on S40 T5 2006?

      Sent from my SM-G960F using Tapatalk

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    3. #2
      Global Moderator tmtalpey's Avatar
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      Jun 2004
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      Um, maybe it's the catalytic converter?

      Seriously, if you're looking to avoid replacing that, you might try replacing the rear O2 sensor, which will have to be replaced anyway since it's 99.9% likely to be destroyed when removing it from the 15yo cat. After that doesn't fix it, you'll be able to swap it over.
      2005 V50 T5 AWD 6MT w/Heico tune, Heico exhaust, Bell intercooler, IPD TCV, Viva Forge CBV, Elevate rear swaybar and torque mount, Snabb shift kit, etc.
      2016 XC60 T6 AWD
      1956 PV444 complete, running
      1956 PV444 very original, very rough

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