Question about 1994 Dodge Intrepid

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I have a 1994 dodge ontrepid with a problem code 21....What does this mean?

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Code 21 is oxygen sensor circuit-voltage ratingin neutral zone orabove normal range, hope this helps get back to me if you need more help,please rate my solution

Posted on Nov 13, 2009

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My 94 Nissan Altima ECU is giving code #21. This is for Ignition signal. Haynes manual says, "See dealer". It is also coding #11 - camshaft sensor.


Code 11 crankshaft position sensor or Camshaft position sensor. Code 21, Ignition Signal, Diagnostic Tree . Best to take to dealer for repairs and to remove codes, the codes do not mean the units are faulty ,just there is a fault, could be just a bad connection.

Mar 19, 2015 | 1994 Nissan Altima

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I have a 1997 Dodge Stratus with Check engine codes as follows: Key ON,OFF,ON,OFF,ON codes 12, 34, 21, 55 I understand 12 is recent disconnected battery & 55 is end of test, but can't find definition of...


Jeff: Go to "Allpar dot com" website and look for a complete list of codes for the older Chryslers. From mine I remember code 34 as having at least two posible meanings: a) EGR Solenoid circuit problema, and b) Speed control problema. Code 21 means a problema in the Oxygen sensor. Amclaussen.

Aug 23, 2013 | 1997 Dodge Stratus

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95 dodge caravan se code 12 21 55


Well, the code 12 is telling you the battery or the computer has been disconnected in the last 50 starts, code 21 is a problem with the O2 sensor, and code 55 is telling you there are no more trouble codes stored in memory.
Code 21 means the O2 sensor is not switching from rich to lean, which can be a faulty sensor or a fuel problem.

Aug 28, 2012 | Dodge Caravan Cars & Trucks

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What do fault codes 12, 21, and 55 mean on a 1996 dodge caravan?


Code 12 = unplug battery recently (allways appear this code)
Code 21 = O2 sensor (the way to solve is replace it)
Code 55 = finish test

Good luck (remember comment and rated this post).

Apr 21, 2010 | 1996 Dodge Caravan

1 Answer

Code error for O2 sensor?


Code 21 the check engine light will flash 21 times cycle the ignition key ON-OFF-ON-OFF-ON within 5 seconds. To cycle the ignition key ON means to turn it only as far as it takes to get the radio to come on. It does not mean to turn the engine on.

Aug 29, 2009 | 1995 Dodge Neon

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Service engine soon on 1998 dodge caravan 3 l


this is a bad o2 sensor code so replace the front o2 sensor.

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1994 dodge caravan, 2wd, 3.0 engine


12 - battery recently disconnected. 21 - Oxygen sensor signal doesn't change (stays at 4.3 - 4.5 V) possibly bad O2 sensor 37 - Transmission temp. sensor reading low.
There are many options that can cause these problems, but loose wiring to the battery and a weak alternator would be one of the first things to check.

Sep 16, 2008 | 1996 Dodge Caravan

1 Answer

Engine diagnostic codes


I don't have a dodge ram but the codes for the dodge vehicles where pretty much the same. For my intrepid the codes read for the following numbers

12 - Problem with battery connection (This usually happens if you disconnect the battery)
21 - Problem with the oxygen sensor circuit
52 - Oxygen Sensor signal input indicates rich mixture during engine operation.

It sounds like you may need to change an oxygen sensor. Hope this helps.

Aug 15, 2008 | 1995 Dodge Intrepid

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