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Could be just coincidence - that after the engine hesitation just happened automagically fix the CEL.
What was the original CEL? You can still scan the ECM - it will have the last CEL as well and any new or pending CELs. Without finding out what the CEL(s) was up there, basically shooting in the dark.
Hesitation can come from a number of sources - everything from fouled plugs, to bad gas, to an ignition/electrical problem, to an induction/exhaust issue, etc.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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