Code help...
irupp33
09-27-2005, 03:42 PM
Ok my truck is pulling codes 21, 25, and 43. I cant seem to figure out whats wrong. Can somebody please guide me in the right direction. I have a 1992 toyota 2wd pickup 5 spd. with 130k on it. any help will deffinatly help...
Brian R.
09-29-2005, 04:03 AM
From 21 and 25 - Replace your HO2 sensor, the one between the engine and the cat converter.
43 is unrelated. Could be your ignition switch or ignition switch-starter electrical circuit.
21 is specific to the HO2 sensor. 25 is more general and could refer to many thing. See if it goes away when you replace the HO2 sensor and reset the ECM.
Make sure the HO2 sensor connections are clean
43 is unrelated. Could be your ignition switch or ignition switch-starter electrical circuit.
21 is specific to the HO2 sensor. 25 is more general and could refer to many thing. See if it goes away when you replace the HO2 sensor and reset the ECM.
Make sure the HO2 sensor connections are clean
Automotive Network, Inc., Copyright ©2026