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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

what ecu code is this?

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Old May 23, 2012 | 06:44 PM
  #1  
JTonJuice's Avatar
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what ecu code is this?

25?
and
21?
help please
http://youtu.be/hnfJ_cVjDjk
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Old May 23, 2012 | 08:52 PM
  #2  
justin_4runner's Avatar
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From: tacoma wa
it looks like a 21 and 52 to me...
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Old May 24, 2012 | 01:48 PM
  #3  
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anyone else?
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Old May 24, 2012 | 01:56 PM
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From: Garner,NC
It is 21&52, glad you added a video. 21 is a O2 sensor, and 52 is the knock sensor.
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Old May 24, 2012 | 02:22 PM
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From: Oregon, USA
Hint...count the blinks.
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Old May 27, 2012 | 06:44 PM
  #6  
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thanks guys.. so need to change knock sensor? truck is runnning fine
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Old May 27, 2012 | 07:49 PM
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From: TENN Native Languishing in Virginia
The knock sensor is USUALLY cause by the pigtail that runs from the wiring harness connection under the intake manifold to the knock sensor. The sensors themselves are seldom faulty (but it can happen).

O2 sensor change should net you significant (2-4 mpg) fuel economy increase.
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