Transmission not shifting after o2 sensor replacement

1990 FORD E-SERIES VAN
200,000 MILES • 5.8L • V8 • 2WD • AUTOMATIC
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SPARKLEPONY
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I was having intermittent problems with the check engine light coming on. I grabbed a code reader and it said the o2 sensor was failing. I replaced the sensor, and now I can't get out of first gear! I can start it and drive just fine, but very slowly. The van will not get into 2nd and almost feels like I'm trying to drive while in neutral if that makes any sense.
Mar 12, 2021 at 10:22 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Hi,

This is an interesting one. The sensor has nothing to do with the transmission. Have you rechecked around where you were working to see if anything was left disconnected?

When you replaced the sensor, chances are you were working around the transmission. Check for disconnected connectors. Also, let me know if the speedometer is working.


One last thing. Here is a link that explains how to retrieve diagnostic trouble codes on this vehicle. You don't need a scan tool. Follow the link and let's see if anything stored.

https://www.2carpros.com/articles/ford-lincoln-mercury-obd1-1995-and-earlier-diagnostic-trouble-code-definition-and-retrieval

Let me know what you find or if you have other questions.

Take care and God Bless,
Joe
Mar 12, 2021 at 11:36 AM
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SPARKLEPONY
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O2 sensors can affect how the transmission shifts.
Oct 1, 2025 at 2:40 AM
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