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Dyber Dodge Dakota JOIN HERE ![Email](http://www.dodgedakota.net/amb/icons/email.gif)
8/02/2004 17:29:08
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Subject: O2 sensor question IP: Logged
Message: Can an oxygen sensor be bad even if it's not throwing codes? Don't the sensors only show a code when they're stuck (not just lazy)? I'm getting worse mileage and I failed smog on high HC (91 Dakota 3.9 V6) and I was considering an O2 sensor change (as well as the work I've already done - new ignition system etc.). Could a 'lazy' sensor be my problem? Am I barking up the right tree in anyone's opinion?
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spt Dodge Dakota JOIN HERE
8/02/2004 18:14:28
| RE: O2 sensor question IP: Logged
Message: I think O2 sensors either work or they don't. You will get codes:
21 oxygen sensor circuit
51 oxygen sensor stuck at lean position
52 oxygen sensor stuck at rich position
if it is not working. It sounds like your catalytic converter is going on you. Go to a muffler shop and they will be able to tell you for sure what shape it is in.
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Bob Lincoln Dodge Dakota JOIN HERE
8/03/2004 09:03:22
| RE: O2 sensor question IP: Logged
Message: LOTS of things cause high HC. Did you recently do a FULL tuneup and oil change? Are you getting any fault codes? Is gas mileage lower than normal?
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Dyber Dodge Dakota JOIN HERE ![Email](http://www.dodgedakota.net/amb/icons/email.gif)
8/03/2004 14:59:24
| RE: O2 sensor question IP: Logged
Message: It's got new coil, cap/rotor, wires/plugs, clean throttle body, new air filter, new oil/filter and clean EGR passages with a working valve. The only codes I'm getting are unrelated to the problem (12, 41).
Oddly enough, it was after doing this work that I noticed the worsened mileage. Other than the lowered mileage, however, the truck is running better than ever.
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? Dodge Dakota JOIN HERE
8/03/2004 15:39:28
| RE: O2 sensor question IP: Logged
Message: You say your EGR is working !
But , how old is it ?
O2 may be problem - getting lazy .
But , EGR " solenoid sensor " may also be ' lazy '
How is compression on all cylinders ?
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Penryn Dodge Dakota JOIN HERE ![Email](http://www.dodgedakota.net/amb/icons/email.gif)
8/04/2004 06:39:30
| RE: O2 sensor question IP: Logged
Message: How can you test something like compression?
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Bob Lincoln Dodge Dakota JOIN HERE
8/04/2004 07:54:06
| RE: O2 sensor question IP: Logged
Message: With a compression tester. 8)
Warm engine fully, take all spark plugs out, block throttle opne, unplug primary coil connection, screw gauge into a cylinder, and crank 3-5 times. Note each reading.
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