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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

Ď95 Blazer S/T, Oxygen Sensor Grief
Q: I am a service technician at a tire store and would like some information on a certain vehicle. The vehicle is a Ď95 S/T Blazer, and the complaint was the "Service Engine Soon" light was on steady. I performed the OBD system check to come to realize a code set, a P0134 code. A fellow co-worker suggested that he had the same problem with his Ď95 Blazer and the fault was with the EGR valve, so I serviced the EGR valve. This did not correct the condition. I had performed the Flow chart tests and come to realize that there was nothing wrong with the sensor or maybe it is intermittent. I had suggested for the customer to go to the dealer. I would like to know if you have any information in this area? Your response would be greatly appreciated.

A: Iím not really sure why you are servicing the Exhaust Gas Recirculation (EGR) valve when the Diagnostic Trouble Code (DTC) P0134 is for a fault in the Heated Oxygen sensor circuit. The simplest description for an Oxygen sensor, is a sensor that is mounted in the exhaust, which creates a signal that is used by the vehicleís computer to determine if the engine is getting the right amount of fuel to run clean and efficient. This oxygen sensor has a little problem, it wonít create a signal if itís temperature is below 600 degrees Fahrenheit. During cold start-up or prolonged idling there is not enough heat to make or keep the sensor working. A heating element is designed into the sensor to get it quickly up to, and aid in, maintaining operating temperature under these conditions. Todayís vehicle computers are sharp enough to figure out that there is a problem (but donít give them too much credit, theyíre still dumb and are easily confused) and will turn on the "Service Engine Soon" light to alert you to a problem. Thatís the easy part! The fun begins in proving that the problem truly exits where the computer says it does, then proving that the offending sensor or electrical circuit is at fault.

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