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Can anyone tell me what this code is?

"P2178 [ 0, 0,21,78]

Thanks in advance for any help.

Hi Davekmore

P2178 - Fuel system too rich at off idle

Means stuff all to me, however here is a link to the Mazspeed service manuals
Have a look HERE for an active link.
I believe it is about 100Mb as a Zip or Rar File

The chapter you need to look in is the 2004 ENGINE PERFORMANCE On-Board Diagnostic which lists the code on page 35

Thanks de Bounce