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OneStop Auto Repair

Sensor check engine light

 

How do you know when a sensor needs to be replaced
The vehicle will usually exhibit a driveability problem (hard starting, stalling, hesitation, poor mileage, high emissions, etc.) and/or an illuminated check engine light. Many things other than a bad sensor can cause driveability problems, but a check engine light is a good indication that the problem is in the electronics.

Mileage is another consideration. The oxygen sensor should go 50,000 miles or more, but some fail in as little as 30,000 miles. Other sensors should last the life of the vehicle. All are covered under the vehicle manufacturer's five year/50,000 miles emissions warranty.

Troubleshooting sensor problems requires checking the on-board diagnostics to see if the computer has set a trouble code (see chart) corresponding to one of the sensor circuits. This is done by either putting the computer into a special diagnostic mode and counting check engine "flashes" or special diagnostic LEDs on the computer itself (many import applications), or by plugging a special scan tool into the diagnostic connector to access on-board diagnostics.

The latter is the preferred technique because it also allows you to read sensor voltages and inputs directly on most GM and some Ford and Chrysler systems.

A trouble code does not necessarily mean a sensor is bad. However. It only means a problem has been detected in a particular sensor circuit. It could be the sensor, the wiring, or a connector somewhere in the wiring harness.

To isolate the fault, a series of diagnostic tests usually have to be performed, following a step-by-step procedure. Tests may require the use of a breakout box that allows individual circuits to be tested. By checking continuity, resistance and/or voltage readings, the faulty component can be isolated.

Another approach is to use a tester that simulates voltage, resistance or frequency inputs from various sensors. The tester is used in place of a sensor to produce a substitute signal. If the on-board computer then responds properly, the sensor is assumed to be faulty.

Intermittent faults are the hardest to find, and some sensor problems may not generate a trouble code at all. A technician may have to test drive the car with a portable "flight recorder" plugged into the on-board computer system in order to locate the problem. When the problem occurs, pressing a button records the various sensor readings for later analysis.

 

OneStop Auto Shop

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(323) 227-9999

 

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OneStop Auto Repair

7935 Santa Monica Blvd.

West Hollywood, CA. 90046

323-227-9999 

 

 

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One Stop Auto is a full service auto repair shop
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