Car scanner check egr driver#

In most cases, their diagrams are right from the factory manuals. They include wiring diagrams and technical service bulletins. Get the BEST auto repair information and are professional-grade shop manuals-period. Then later, if the problem does not reoccur, the computer will turn off the check engine light and store the code as a HISTORY CODE. Some computers are programmed to see a problem, store a code, and light the check engine light. But if the problem is not emissions related, and also not critical, it may be stored in the computer but not light the check engine light. For example, any problem that affects the emissions system will automatically light the check engine light. There are other cases where there’s no check engine light but codes. In that case, you could scan the computer and find a code, even though the light wasn’t on. If a problem occurs but does not meet the software’s threshold for the number of times the problem must occur before lighting the check engine light, the trouble code may be stored as a PENDING CODE.

Car scanner check egr driver#

Many car makers design their computers to alert the driver of a problem by turning on the check engine light and storing a trouble code in the computer’s memory. Repair Topics > Computers and Sensors > No check engine light but codes No check engine light but codes My check engine light is on but no codes