Check engine light came on throwing two codes P1167 and p1259 I need help!

check the area of where you were working on the trans for possible disconnect or damage to component wiring or sensor https://www.engine-codes.com/p1167_kia.html https://www.justanswer.com/kia/495n1-kia-optima-optima-setting-codes-p1166-p1167.html

P1166 pertains to the upstream O2 sensor heater circuit. P1167 pertains to the upstream O2 sensor output.

Please read about this fault code and its possible sources. P1167 Hyundai O2 Sensor System Lambda Controller at the Limit Bank 2

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OBD2 Code P1167 2002 Hyundia

Assuming you have the 2.3 L 4 cylinder engine, the CYP sensor [Honda does not call it a camshaft sensor] is located in the distributor. It also has 2 crankshaft sensors, located down at the front of the crankshaft. You need to remove the timing belt covers to access those.
FYI, P1259 is a VTEC system [variable valve timing] malfunction code. First step would be to change the engine oil and filter. Dirty oil can cause the VTEC solenoid to stick.

Hello there:
P1167 and P1166 codes relate to the primary O2 sensor heater malfunction.
there are two different O2 sensors, a "universal" sensor from Autozone and a supposedly OEM sensor from O'Reilly's. Both of them may cause the car to throw a p1166 or P1167 code and run rough. so i highly recommend getting a O2 sensor from Honda, and this will fix the problem .
It turns out that none of the aftermarket probes from Bosch or Denso will work on a ULEV (F23A4) 4 cyl. engine. Honda had different part number probes for the normal VTEC 4 cyl. and the ULEV Vtec engine and the probes look different and have different length cables. The computers at O'Reilly's, Autozone, or NAPA made no distinction between these two engine types.

The P1259 : is problem in the VTEC Oil Pressure Switch circuit or VTEC Solenoid Valve circuit.
check the wire on the VTEC Oil Pressure if it's loose.

P1259 is a code for vtec malfunction usually cause by a bad vtec solenoid, vtec pressure sensor, low oil level, bad connection. Was oil change done? May want to check the oil level. P1166 is a code for a primary o2 sensor 1.

P 0151 oxygen sensor 1, bank 2 - low voltage
Cause- Exhaust leak, wiring short to earth

P0650- Malfunction indicator light

P1166 & P1167 these codes do not exist, if you check these numbers I may be able to assist you further.