Section 118 (Engine Controls - Trouble Shooting - No Codes - CNG, Flex-Fuel & Gasoline): Introduction

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2003 Mercury Sable, 2003 Mercury Mountaineer, 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: This article covers gasoline, flex-fuel and CNG vehicles only. For Bi-Fuel (gasoline/LPG or gasoline/CNG) vehicles, go to appropriate TROUBLE SHOOTING - NO CODES - BI-FUEL article.

Before proceeding with diagnostics, check for applicable Technical Service Bulletins (TSBs). If there are no applicable TSBs, perform QUICK TEST in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Use this article to diagnose driveability problems existing when a Diagnostic Trouble Code (DTC) is not present.

Symptom checks can direct the technician to malfunctioning component(s) for further diagnosis. A symptom should lead to a specific component or system test and/or adjustment.

NOTE: For specifications, see appropriate ON-VEHICLE ADJUSTMENTS or SERVICE & ADJUSTMENT SPECIFICATIONS article.