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1998 Chevrolet C K 1500 Base Reg Cab 117.5 WB (CMI)

1998 Chevrolet C K 1500
Trim Info:
Rear Wheel Drive, Reg Cab 6.5' Fleetside
17 mpg city / 23 mpg hwy
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October 22, 2013, 10:43 am

Kevin D

Question: had a p0141 engine light i changed the sensor now i get a p0140

i get this on my 98 chev pickup 5.7L p0141 was heater malfunction in the 02 i changed the 02 for a new one and now i get a p0140 wich is no activity detected please help.

October 27, 2013, 6:12 pm

Ron W
Expert Mechanic

Check you pins in the connector. One of them may be bent or not fully installed. If they are OK, check the wiring for rubbing. The harness may be damaged for the O2 sensor. Or the new sensor is defective.

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October 28, 2013, 1:43 pm

Kevin D

company send me a new sensor and still same thing so i checked the wiring does not seem broken anywere can it be broken under the conduit?

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October 29, 2013, 6:48 pm

Ron W
Expert Mechanic

It could be shorting to itself (the other wires in the conduit) At this point you need to do some electrical testing of the circuit to see where the issue is.

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October 30, 2013, 7:32 am

Kevin D

can i take the whole harness right out? it foes to the pcm can i just disconnect it an take out and then check it or how do i tets it with a tester?

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November 3, 2013, 11:38 am

Ron W
Expert Mechanic

You don't need to remove the whole harness usually, but testing is not easily explained online.

You will either need some local instruction, or may need a shop to help you with the electrical testing.

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