Service bulletin ZLH_Lexus POL17-

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
Type	Service bulletin
NHTSA id	10143917
Published by NHTSA	2018-08-20
Manufacturer's number	ZLH_Lexus POL17-
Manufacturer's date	2018-07-02
NHTSA component	ENGINE AND ENGINE COOLING

NHTSA's summary

Warranty Policy Bulletin: Lexus has received reports of customer concerns regarding the illumination of the check engine light (Malfunction Indicator Light) due to moisture/water in the Air Injection Pumps and/or Air Switching Valves. Lexus has received reports of customer concerns regarding the illumination of the check engine light (Malfunction Indicator Light) due to moisture/water in the Air Injection Pumps and/or Air Switching Valves. Although the Air Injection Pumps and Air Switching Valves are covered by Lexus? New Vehicle Limited Basic Warranty* for 4 years or 50,000 miles (whichever comes first) and by the California Emission Warranty* for 7 years or 70,000 miles (whichever comes first), we at Lexus care about the customers? ownership experience. Lexus is now extending the warranty coverage for repairs related to illumination of the check engine light (Malfunction Indicator Light) due to moisture/water in the Air Injection Pumps and/or Air Switching Valves. The following information is provided to inform you and your staff of the program notification schedule and your degree of involvement.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine

Vehicles listed
LEXUS GX	2010, 2011, 2012, 2013

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
LTT003110A	2021-12-20. Service bulletin. Adhesive & Sealant Cross Reference Information/ Engine Hybrid System
LTT003110	2021-12-20. Service bulletin. Adhesive & Sealant Cross Reference Information/ Engine Hybrid System
LTT000110A	2021-12-20. Service bulletin. Oil Viscosity Applicability and Cfhange Interval Guide
LTT000110	2021-12-20. Service bulletin. Oil Viscosity Applicability and Cfhange Interval Guide
L-SB-0002-20 Rev	2020-09-14. Service bulletin. TSB: Vehicles may display evidence of a fluid leak or fluid seep from powertrain components. This bulletin explains how to determine the differences between a fluid leak versus a fluid seep. Cases that are determined to be a ?leak? should be repaired accordingly and will be covered under warranty if applicable. Cases that are determined to be a ?seep? should be documented on the repair order and inspected at the next service interval. Follow the Repair Information in this bulletin to determine if the concern in question is a fluid leak or fluid seep and review the Repair Procedure section to address this condition.
L-SB-0001-18-Rev	2019-09-03. Service bulletin. TSB: REVISION NOTICE July 01, 2019 Rev1: G1668 Applicability has been updated to include 2019 ? 2020 model year Lexus vehicles. G2158 The Techstream Preparation and Process Overview sections have been updated. Any previous printed versions of this bulletin should be discarded. SUPERSESSION NOTICE The information contained in this bulletin supersedes Service Bulletin No. L-SB-0021-14. G1765 Applicability has been updated to include applicable 2018 models and 2016 ? 2018 model year RC 300 and 2015 ? 2018 model year RC 350 vehicles. ? Applicability has been updated to exclude 2001 ? 2003 model year ES 300 vehicles. Service Bulletin No. L-SB-0021-14 is obsolete and any printed versions should be discarded. Be sure to review the entire content of this bulletin before proceeding. Flash reprogramming allows the Electronic Control Unit (ECU) software to be updated without replacing the ECU. Flash calibration updates for specific vehicle models/ECUs are released as field-fix procedures described in individual Service Bulletins. This bulletin details the Techstream ECU flash reprogramming process and outlines the use of the Technical Information System (TIS) and the Calibration Update Wizard (CUW). Flash calibration updates can only be applied to the vehicle/ECU combination for which they are intended. ECUs have internal security that will not allow them to be programmed with another ECU?s information. NOTE ECU is a Lexus term used to describe integrated computerized devices responsible for managing the operation of a system or subsystem. For the purposes of this bulletin, the term ECU is used as a generic label for the following SAE J1930 standard references: ? Powertrain Control Module (PCM) ? Engine Control Module (ECM) ? Transmission Control Module (TCM) ? Any other Lexus-specific control unit
JLG-Dealer Email	2019-07-08. Service bulletin. Dealer Email: There is a possibility that moisture in the air may cause a filter in the vehicle emissions system to degrade. This degradation could cause damage to other parts of the vehicle emission system and illuminate the check engine light (Malfunction Indicator Light).
JLG-Region Email	2019-07-08. Service bulletin. Region Email: There is a possibility that moisture in the air may cause a filter in the vehicle emissions system to degrade. This degradation could cause damage to other parts of the vehicle emission system and illuminate the check engine light (Malfunction Indicator Light).