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'94 LS 400 Engine Codes ; 25 28 48

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Old Mar 21, 2016 | 03:29 PM
  #1  
colorfan's Avatar
colorfan
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Default '94 LS 400 Engine Codes ; 25 28 48

hi all,

first post here. i have a 94 ls400 (bought in June, think its before the production change?) that has these lights on. I replaced the ECM last year with a refurbished one, not sure if that's related to these codes.

I brought it into a mechanic specializing in older cars and he was unsure after about 4 hrs of diagnosing the issue. he thought i may have gotten a newer ECM then i needed to, but on the site it said it was for a '94 LS400.

are all these issues connected? should i just replace the rear o2 sensor? its got low mileage (121K sh) so i dunno what to doo
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Old Mar 21, 2016 | 04:20 PM
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Originally Posted by colorfan
hi all,

first post here. i have a 94 ls400 (bought in June, think its before the production change?) that has these lights on. I replaced the ECM last year with a refurbished one, not sure if that's related to these codes.

I brought it into a mechanic specializing in older cars and he was unsure after about 4 hrs of diagnosing the issue. he thought i may have gotten a newer ECM then i needed to, but on the site it said it was for a '94 LS400.

are all these issues connected? should i just replace the rear o2 sensor? its got low mileage (121K sh) so i dunno what to doo
Check your O2 sensor heater resistances from the O2 sensor plug towards the O2 sensor.. Should be around 6 ohms or less.
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