Tag Archive for ‘check engine light’

How to use an OBD-II scanner to diagnose engine problems

OBD-II scanner courtesy of traderscity.com

The On-Board Diagnostic II (OBD-II) is a reporting system for engine problems, which is present on all vehicles manufactured after 1996. This system illuminates the Check Engine light when it detects a problem. Newer systems have a digital port which allows you to use a scanner to determine the nature of engine problems. These readouts are displayed as Diagnostic Trouble Codes (DTCs). While any auto repair shop can run an OBD-II scan on your vehicle for a fee, many auto parts stores will lend you a scanner free of charge, allowing you to diagnose the problem yourself. Running a scan is simple, and only requires a scanner, along with a pencil and paper to record DTCs.

Check Engine Light – Top Five Most Common Trouble Codes and what they mean

Check Engine Light

Seeing a check engine light come on can scare most drivers, but it actually is a very good thing to see. The check engine light is a warning device that comes on when your vehicle has a problem with the emissions control system. The top five trouble codes are as follows.

1.) Code P0300-P0310 this code is for a misfire which can be any combination of spark plugs, plug wires, distributor cap coils of the fuel injectors and even the PCM.

Oxygen Sensors are Critical to passing Emissions Testing

In 1976, Bosch introduced one of the most important technologies for reducing emissions. Oxygen sensors have been standard equipment since 1980.

The oxygen sensor monitors the level of oxygen in the exhaust so an onboard computer can regulate the air/fuel mixture to reduce emissions. The oxygen sensor in located in the exhaust manifold down pipes before the catalytic converter.

As oxygen sensors age, they begin to fail and prevent the onboard computer from making the necessary corrections, allowing the mixture to run rich affecting your emission inspection, most inspection stations will be able to tell you if your emission failure is due to oxygen sensor. (Oxygen sensor failure usually prompts a sensor light or check engine light to come on)