Durametric fault code question
Getting these two codes:
PO139 - Fault Code 17 - Sensor ageing behind cat converter cylinder (1-3) PO140 - Fault Code 12 - O2 sensor behind cat converter cylinder (4-6) Car is a 2002 S These are just for bad 02 sensors, right? Nothing about the cat itself? Just replace the two sensors? And does behind mean before or after the cat? Thanks for the help |
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I would use the Durametric to read the voltages for the sensor to see if they are in range, if they are, you may want to check its harness for problems. |
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Yeah, you've got a problem. First of all, this is what a good before and after sensor set should look like:
http://i1140.photobucket.com/albums/...ps6728ac22.jpg When the main three way cat goes bad, the sensor behind the cat starts following the voltage curve of the one ahead of the cat, because the cat is no longer converting the gases: http://i1140.photobucket.com/albums/...pscd3fb45b.jpg In your case, it does not look like the cat (yet), but more like the signal is interrupted or inconsistent, which would be more likely a wiring or electrical issue. |
could it be the connector on the O2 sensor?
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Thanks for the help
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Now I'm getting 1128 and 1130 after replacing the o2 sensors behind the cat
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what about the MAF?
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Makes sense, thank you
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MAF values reading low
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getting the codes again after replacing MAF, O2 sensors and AOS
what's next on the list? |
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Re-read the above again............................ |
Yes, which one first. Neither are easy without the right testing equipment for a DIY, right.
Would either air leaks or fuel pressure/delivery be more likely? |
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