Backfire when started

Tiny
GIJI79
  • MEMBER
  • 2014 CHEVROLET SONIC
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
I had the codes read when my check engine light came on, the dealership said bad O2 sensor. So I changed them both. Within two days the light was back on and I took it to O'reillys and the same codes came up. I replaced both sensors again. This morning when I started the car it backfired out of the tail pipe and the light came on again. Could it be the catalytic converter that needs to be changed?
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Monday, April 16th, 2018 AT 7:03 AM

1 Reply

Tiny
STEVE W.
  • EXPERT
What are the exact codes? Most O2 sensors get changed out when there is nothing wrong with them. 90% of the time the issue is wiring or a fault farther upstream like an exhaust leak that lets in air or a vacuum leak causing a lean mix.
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Tuesday, April 17th, 2018 AT 8:30 PM

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