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Check engine light comes on

Tiny
LETTY3
  • MEMBER
  • 1997 CHRYSLER LHS
  • 3.5L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 119,000 MILES
Recently my check engine light came on. Using my meter light code I found meter light code 21 on scan tool code P0140. Since the car had 119,000 miles and I decided to replace all of the o2 sensors(four of them) I then cleared the code using the scan tool. The check engine light stays off, until I drive 50 miles or further. The scan tool then says "Down stream 025 stays at center" Can you help me on how to fix this problem or what to do? Thank you
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Friday, May 27th, 2016 AT 6:14 PM

3 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
What is the code it is displaying now, to make sure it is accurate, clear codes and re drive until light re sets and re scan, post the code set.
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Friday, May 27th, 2016 AT 9:50 PM
Tiny
LETTY3
  • MEMBER
  • 3 POSTS
I get code P0140.
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Saturday, May 28th, 2016 AT 4:19 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
A for things to start checking are, shorted heater circuit in O2 sensor. Shorted signal circuit in O2 sensor. Melting of harness connector or wiring due to contact with exhaust system Water intrusion in harness connector or PCM connector Bad PCM, have a look into these first.
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Saturday, May 28th, 2016 AT 5:52 PM

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