what gauge is the rear o2 sensor 1999 subaru forester forum

When a code is cleared, the emissions systems monitors are also turned to not ready status. It is simply not enough to have the code number but rather a thorough analysis must be performed by a qualified professional technician. It is almost impossible to accurately diagnose and repair a conditional code with a code reader from a local parts house. Conditional codes are the hardest to accurately diagnose and repair and are typically the ones that do the environment the most harm. A conditional code is set when a specific condition triggers the ECM to Command on the check engine light. A component code usually indicates a problem with a particular device, its circuitry or controls.

There are essentially two types of OBD II Fault codes, conditional and component. These are just two examples of many possibilities. The catalyst system is designed to lower tail pipe emissions to acceptable levels. The gas cap is meant to keep the fuel vapors sealed in the tank and evaporative emissions system rather then allowing the fuel vapors to enter the atmosphere as hydrocarbon emissions. Normally neither one will adversely affect the vehicles performance but both will allow the vehicle to excessively pollute our environment. But the light can also come on when the catalyst system has failed. In some cases the light can come on when the gas cap is loose. But what the light represents is a potential failure in one or more of the vehicles systems that are meant to control the level of tail pipe and evaporative emissions produced to acceptable levels. In many cases the vehicles overall performance won’t change much if at all when the light comes on, and is thus not taken seriously by the majority of car owners. The check engine light comes on when the ECM (Engine Control Module) recognizes a malfunction with an emissions control device or an emissions control device monitoring system or if a specific condition is not being met. While it’s true that prior to 1996 the check engine light did exist on vehicles, it took on an entirely new meaning and purpose in 1996.And this is where the confusion starts. Part of this technology involves the check engine light or MIL. As well as meet newer vehicle emissions regulations.

had to be OBD II compliant (On Board Diagnostics two). Starting in 1996 all passenger vehicles and light duty trucks produced or imported for sale in the U.S.

What gauge is the rear o2 sensor 1999 subaru forester forum