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Engine light comes on after reaching 55 mph, could this be oxygen sensor?
1999 Chevrolet Silverado 1500

Engine light comes on after reaching 55 mph, could this be oxygen sensor?

(1999 Chevrolet Silverado 1500)
1995 Chevy Silverado Half Ton 5.7L
Ever since I've let a non mechanic work on my truck, my check engine light comes on when I reach 55mph and the only way I get it to go off is to shut it off for a few seconds. But I've replaced distrib.cap, rotor bug, etc.
Should I go ahead with a 02 sensor?
And could I just take the upper off and soak it in cleaner for required time, then dry it good and reuse? Thank you in advance! ToolHeadTj
Motor is sound w/ no smoke, or blow by...and definitely no engine noise.
What seems to make the problem better or worse? As the motor warms up, it gets worse on length of time
How long have you had this problem? For last 6mths
Tags: chevrolet, silverado 1500
2 answers & 1 comment
Popular Answer
on August 24, 2019

SCAN TEST REQUIRED !
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on August 25, 2019

You’ve posted two different year models - 1995 will be OBD 1 operating system.

1999 will be OBD 2 operating systems.

A comprehensive ‘professional’ scan test is highly recommended regardless of which system is present.

Parts stores are incapable of testing OBD 1 systems and are very inefficient at testing OBD 2 systems!


Good luck!
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on August 24, 2019

SCAN TEST REQUIRED !
Sign in to reply
on August 25, 2019

You’ve posted two different year models - 1995 will be OBD 1 operating system.

1999 will be OBD 2 operating systems.

A comprehensive ‘professional’ scan test is highly recommended regardless of which system is present.

Parts stores are incapable of testing OBD 1 systems and are very inefficient at testing OBD 2 systems!


Good luck!
of Top Tires on August 30, 2019
Come to Top Tires Auto Center, we can check your car for free if you do the work here. We are in 10530 Carmenita Rd. Whittier, 90605. Tell the guys you come from Repair Pall
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