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We have a 2003 Sedona EX with 3.5L V6 and 160k miles. Timing belt was changed at 94k miles. Plugs were last changed at 150k miles. My wife normally drives it so I don't have a lot of direct knowledge about what it was doing before it stopped yesterday; however here is what I know.

She drove home from work without any problems. I met her at home and we both got in the van to leave for a meeting and when I went to start it there was no crank and no start. CIL came on and I checked it with our scanner. It threw PO335 - crankshaft position sensor. (no other codes)

Battery is fine (replaced appx. 14 mths ago with no problems since) and all accessories run and lights do not appear dim. Battery voltage measured at 12.74. Ran Kia Tech Info site's diagnostics on CKPS and it checked out fine.

Checked ignition fuse in footwell and fuses and relays under hood and none appear to be blown or non-functioning.

Given that the engine does not even crank, it seems like perhaps the PO335 is a red herring. I've read elsewhere that PO335 will throw if you crank for more than 2 seconds and there is no spark.

This makes me wonder if its either the ignition failure sensor or ignition module or the starter. Any suggestions as to how to determine which might be the cause amongst these 3 or is there something else I'm missing?

Assuming the starter is the next step, is taking out the air box the best way to check the starter's wire connections or can you inspect these from under the vehicle?

Any suggestions would be greatly appreciated. We just replaced the steering rack, power steering pump, changed the plugs and had new valve cover gaskets installed (terrible oil leak prior) at appx. 150k miles so really hate to throw much more money at this but it's worth nothing if I can't get it running again.
 

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Have you tried tapping the starter housing with a hammer and see if it starts? Generally, that's a way to check if the starter is on its way out.
 
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