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Service bulletins for the 2020 Kia Optima

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

121 on file from NHTSA, as of 2026-10-19.

About P1326 on the 2020 Kia Optima: what the code means, and the bulletins and recalls about the same components.

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Only bulletins with trouble code: P1326 are shown. Show all

Bulletins, newest first
PI2108YZ_TSB_R12024-11-14. Service bulletin. ENGINE. TECHNICAL SERVICE BULLETIN: PRODUCT IMPROVEMENT CAMPAIGN: SUBSEQUENT REPAIR ACTION: ENGINE REPLACEMENT INSTRUCTIONS FOR DTC P1326 (PI2108Y/Z) - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides information related to the Technical Service Bulletin previously published in (PI2108) titled “Knock Sensor Detection System - ECU Logic Improvement” for certain 2019-2020MY Optima P/HEV (JF P/HEV) vehicles equipped with Nu 2.0L GDI engine, produced from July 6, 2018 through October 28, 2019. Specifically, this bulletin provides instructions on which procedures to follow if, after installation of the KSDS, any one of the subject vehicles below return to the dealer with Diagnostic Trouble Code (DTC) P1326 (Knock Signal Range/Performance).
PI1802YZ_TSB2023-09-06. Service bulletin. ENGINE AND ENGINE COOLING. SUBSEQUENT REPAIR ACTION: ENGINE REPLACEMENT INSTRUCTIONS FOR DTC P1326 (PI2108Y/Z) - This bulletin provides information related to the Technical Service Bulletin previously published in (PI2108) titled Knock Sensor Detection System - ECU Logic Improvement for certain 2019-2020MY Optima P/HEV (JF P/HEV) vehicles equipped with Nu 2.0L GDI engine, produced from July 6, 2018 through October 28, 2019. Specifically, this bulletin provides instructions on which procedures to follow if, after installation of the KSDS, any one of the subject vehicles below return to the dealer with Diagnostic Trouble Code (DTC) P1326 (Knock Signal Range/Performance).

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.