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Need Help with Engine Diagnostics
Hi Guys,
My brother is the original owner of a 2007 Boxster S with 142K miles.
Had had an engine failure at ~55K miles and had a factory crate engine installed at that time.
A couple of days ago, he got a CEL along with rough idle and a "something is broken" noise coming from the engine.
The CEL codes are:
P0503 - Vehicle speed signal
P0300 - Misfiring checksum error
P0306 - Misfiring cylinder 6
Can anyone offer any suggestion as what might be the problem?
Any & all input would be appreciated.
TIA
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