Question about 1994 Chevrolet Astro

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1994 Chevy Astro problem

Hi.....I'm getting a 44 code from my check engine light code. I'm guessing it's a bad o2 sensor. I'll be dinged if I can find this thing. Can you help?..Thanks petezilla

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Code 44 is usually due to a bad oxygen sensor, they often start to read lean as they get older.

Please use this link get the code:
http://www.autozone.com/addVehicleId,2311303/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c152800a7ff8



Its the service manual:

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800a7f9b

Good luck...

Posted on Aug 13, 2008

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causes

A code P0420 may mean that one or more of the following has happened:
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  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
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possible soloutions

Some suggested steps for troubleshooting a P0420 code include:
  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.


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