Flight Crew Air Transport Pilot (ATP)
Flight Crew Type 3667
Situational Awareness
Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Issued New Clearance
Human Factors
ATC cleared us the DSNEE4 to DSNEE; descend via. We were given two intermediate altitudes on short notice in the descent then told to resume descend via. The 20R GS was out according to the ATIS and we anticipated getting the RNAV RNP Z to 20R. We selected that before descent and at DSNEE the LNAV turned us to the fix after DSNEE on the RNAV Z Approach instead of going to JWARD as depicted in the arrival inset chart. ATC then turned us 10 degrees right and vectored us to final. There were no traffic separation issues or other deviations. We executed a visual approach without incident.
B737NG First Officer reported a track deviation occurred on the DSNEE4 arrival into SNA.