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P1526 Throttle Control Lower Position not Learned
The control unit recognises a mechanical malfunction of the following component via an internal evaluation logic:

A111 Throttle Valve - Positioner
or

Wrong/intermittent/erratic connection respectively wrong signal in circuit to control unit terminal 14, 23, 30, 39, 56, 58 (XC1)

So likely either a faulty throttle body or wiring issue between throttle body and ECM
 
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