B737NG first officer reported a track deviation occurred on the DSNEE4 arrival into sna.

Attributes
ACN	1579972
Time
Date	201809
Local Time Of Day	1801-2400
Place
Locale Reference	SNA.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B737 Next Generation Undifferentiated
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR DSNEE
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Type 3667
Events
Anomaly	Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types

Narrative:

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.

Original NASA ASRS Text

Title: B737NG First Officer reported a track deviation occurred on the DSNEE4 arrival into SNA.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.