P0353,P0356, P0016 codes
First post here..and hoping for pointers on a odd issue.
Saw the check engine light and hooked in my scanner. Saw the codes P0353,P0356, P0016 codes .
Took it to the independent mechanic, who spent 2 hours trouble shooting without finding root cause.
Switched the ignition coils / spark plugs but still the code P0353,P0356 persists.
Replaced with new camshaft magnet and sensors but still the code P0016 persists.
BTW, had the same issue last year around this time and so we replaced the ignition coils/ camshaft magnet and sensors. Code went away then but not now.
Any ideas on where to troubleshoot ? Thanks for pointers.
Nach
2007 E350 RWD sedan

engine=27296430420706
had the balance shaft replaced in 2012 when it had about 50k.
replaced cam shafts / iginition cool last year.
took it to the dealer today and they wanted $160 to diagnose. Said fine do it. Then they said they wanted 7 hrs additional Diagnosis to pin point the issue !
They suspect it’s a timing issue and it could be timing chain, balance shaft or ECU. They might to replace each one in order. BAM a little floored.
Please help. Thanks.
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