It may be that the knock sensor error (43) and EST error (42) are related.
Verify that the spark plug wires are correctly connected. The firing order is as follows:
If you have not already done so, check the connetors for the crankshaft position sensor (CKP) and camshaft position sensor (CMP). Also be sure the tan/black wire on terminal "B" has a good connection and that there is +5V present on that wire when the ignition is on:
The spark plug wires can be tested for continuity with a multimeter. 1000-5000Ω per meter of length is typical.
It might help the diagnosis if the knock sensor is bypassed temporarily. The knock sensor connector can be disconnected and the circuit can be connected through a 3,900Ω (3.9K) resistor to ground to force the ECM to accept the signal level and not set the 43 error code.