Code 21

Tiny
PITAX1
  • MEMBER
  • 1921 DODGE NEON
I have a code 21 on a 95 neon, do you know what this is?
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Friday, March 23rd, 2007 AT 10:47 AM

2 Replies

Tiny
MERLIN2021
  • EXPERT
21 Oxygen sensor signal doesn't change (stays at 4.3-4.5V). Probably bad oxygen sensor
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Tuesday, March 27th, 2007 AT 2:16 PM
Tiny
VASCOTT76
  • MEMBER
WILL A CODE 21 ALSO CAUSE THE CAR TO HERK AND RUN ROUGH NOT ACCELERATE ALSO AND IS CODE 21 THE UPPER O2 OR LOWER BY THE CATALYTIC CONVERTER
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Friday, April 18th, 2008 AT 12:30 PM

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