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Code 1187 is either "Engine Oil Temperature Sensor Circuit Voltage Low" or "Engine Oil Pressure Sensor Circuit Voltage Low". I don't think the 97 Tahoe had a oil temp sensor, so it is probably the oil pressure sensor. Does your gauge show low?

I paid $3.03 this morning for mid-grade.

Where are you located?
 

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Premium Member
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We have 87 to 93 octane here. Mid grade is around 90. Wish we had some 95.

Cableguy, I show the code that you described to be P1161, not P1187.
 
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