Question about 1999 Chrysler 300M

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1999 300m I start the car and it idles at 3k And its reading catalyst mon inc oxygen sens mon inc oxygen sens htr inc egr system mon inc

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  • Chrysler Master
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I might think it was time to see a really good mechanic myself . or fix it myself and have it blow up

Posted on May 10, 2015

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Posted on Jan 02, 2017

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czaa
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SOURCE: Check engine light was on.

hook it up to a tech II-it displays a data stream to target problem--cause rite now u cud replace parts and probly get nowhere--hav u done ur regular tuneup and fuel area cleanin

Posted on Mar 25, 2011

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I scanned my car but got no codes. Catalyst mon INC, H/D Catalyst n/A, sec air system N/A, Oxygen sens mon INC, Oxygen sens HTR INC, ERG/VVT sys mon INC. any help would be appreciated. thanks


INC means the self tests that the ODB system runs are incomplete. N/A means those systems are not tested on your vehicle. If all codes are reset/cleared, or if the battery has been disconnected, the computer will run all the diagnostic tests to establish that the systems are working properly. In most states, most of these tests must be completed with no trouble codes detected before passing inspection. You will have to run the car through a number of 'drive cycles' to get all the tests completed.

Feb 02, 2016 | 1999 Ford Taurus

1 Answer

Idling rough after replacing alternator


sounds like you got a smaller amped alt then what was there.

Feb 14, 2013 | 1996 Ford Bronco

1 Answer

Where is 02 sens htr located on dgdge ram truck1500


The O2 heater is part of the O2 sensor itself. You would need to replace the oxygen sensor if the heater is an issue.

Jul 05, 2012 | 2008 Dodge Ram 1500 2WD

2 Answers

Sensors not ready 2001 Chevy S10. I have driven more than 500 miles and sensors still read not ready. 02 Sens Not Ready, 02 Sens Htr Not Ready, Catalyst Not Ready.


This is the heater side of the sensor. It has shorted out. You can replace it, but check for broken or melted wires (around the exhaust).

Aug 19, 2011 | 1996 GMC Yukon

1 Answer

My engine light is on so i took an OBD reading and it showed the error codes P0401, P0420 and P0133. What do I need to fix?


P0401 is EGR valve, low circulation detected.
P0420 Catalyst system.
P0133 is O2 sensor bank 1 sensor 1.
All these codes are emissions related, so i would start with the EGR valve, it's probably clogged with carbon. The catalytic converter could be also, check that for excessive backpressure. The oxygen sensor can be tested, replace if needed. Good luck, i hope this helps.

Jul 29, 2011 | 2000 Honda Prelude

2 Answers

Check engine light was on. Connected scan tool, got data below and cleared faults. drove car 5 miles, check engine stayed off. p0300 random multiple misfire detected p0325 knock sensor 1 circuit...


If the check engine light stayed off then that means that those errors are not present at this time. It is not un common to have intermittent faults but I would not preced any further until the light comes back on. Then re-scan the code see which are to begin diagnostics.

Mar 25, 2011 | 1997 Cadillac DeVille

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