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  #1  
Old 06-11-2019, 06:41 PM
DBrockett DBrockett is offline
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Default Where is that Oxygen sensor?


Maintenance required light=Oxygen Sensor
Got the book and the online manual but still having trouble locating this sensor. It isn't on the manifold but I can't find it on the exhaust either. Anyone else with a 1992 D250 5.2L that has changed this part?

Last edited by DBrockett; 06-11-2019 at 06:53 PM. Reason: added info
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  #2  
Old 06-11-2019, 08:22 PM
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GTyankee GTyankee is offline
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You should first take the vehicle to a chain type auto parts store & request that they connect up their scan tool, most people go to either Autozone or Advance Auto, but other places have the scan tools too
The scan tool will show what code(s) have been set
Knowing the code(s) will tell you what part or parts are actually bad

Writing down the code(s), going online to this site, find the code in the P code list

https://www.obd-codes.com/trouble_codes/

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Last edited by GTyankee; 06-11-2019 at 08:27 PM.
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Old 06-12-2019, 03:02 PM
Gen1dak Gen1dak is offline
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No, Maintenance Required light = time to pay dealer stupid money to turn the light off and over charge for basic maintenance, and non-necessary BS.


A faulty O2 sensor doesn't usually trip an engine light. It will, however, cause the engine to run rich, eventually getting so bad it will belch black smoke and water those eyes. An added bonus is you can watch the fuel needle move towards empty just like the old days when flooring it in a carbureted Big Block muscle car. By that point, you're dumping so much gas, the cat is being damaged. As to the O2 sensor, which is probably well into it's useful lifespan, get under the truck and look to the single exhaust pipe in the section between where the 2 pipes join, and where the catalytic converter is.
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Old 06-12-2019, 04:58 PM
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Pre 2000 chrysler products had either 2 or 3 Oxygen sensors
2000 & newer chrysler products had 4 sensors

The o2 sensors in front of the catalytic converters are called Heated o2 sensors
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Old 06-12-2019, 07:21 PM
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92 was the first year for the 5.2 magnum, If you have the magnum you have two 02's one before the cat and one after. If you still have the LA motor it's one 02. And as said "maintenance required" is just a timer that goes off after a certain amount of time. It has nothing to do with the "check engine light".
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Old 06-12-2019, 10:45 PM
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I agree with the replies indicating the "Maintenance Required" message is probably not driven by an actual fault, just an algorithm (mileage and maybe how the vehicle is driven).

Is your check engine light (CEL) on ? How many miles on the truck ? O2 sensors can go up to 100K miles or more, but recommended replacement is usually more like 60K, since they get lazier with time and the signal of the pre-cat sensor is used to control your ECU. If you go way long, you might damage your cat.

GTyankee linked a nice you tube on the replacement. If I had more than 60K on the sensor, I might replace it DIY. Then find out on line how to reset the message and drive with confidence.

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Old 06-12-2019, 11:07 PM
bspRAM bspRAM is offline
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Default addendum - turning the reminder light out is hard . . . .

All that I could find on the web was that for 89-95 Dakotas the light only resets via an obsolete "OBD I" tool that many dealers just no longer have. It is programmed to come on with mileage.

It is only a "reminder", so many have either taped it over with electrical tape or removed the bulb. One intriguing POSSIBILITY is that it might turn itself off after some predetermined number of restarts - but that's just a thought that I saw no data to support.

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Old 06-13-2019, 01:45 AM
Gen1dak Gen1dak is offline
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According to the FSM on my '91 RC, the maintenance light is programmed to come on at specific mileage points. I've also read where these things can be set to illuminate after a preset number of operating hours.

Last edited by Gen1dak; 06-13-2019 at 01:57 AM.
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Old 06-13-2019, 01:52 AM
Gen1dak Gen1dak is offline
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OBD I Magnums ('92-'95) only have pre cat O2 sensors, and since they had a single pipe and a single cat, that means they had 1 O2 sensor upstream of the cat. Power was supplied to cause it to heat more quickly in an effort to reduce the time it took before the O2 sensor began operating after startup, thus reducing emissions during initial warm up. It is the OBD II Magnums ('96 and newer) that have both pre and post cat O2 sensors, meaning they have at least 2, or as many as 4 (on dual exhaust models).
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Old 06-13-2019, 01:59 AM
Gen1dak Gen1dak is offline
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It'll burn out eventually.



Quote:
Originally Posted by bspRAM View Post
All that I could find on the web was that for 89-95 Dakotas the light only resets via an obsolete "OBD I" tool that many dealers just no longer have. It is programmed to come on with mileage.

It is only a "reminder", so many have either taped it over with electrical tape or removed the bulb. One intriguing POSSIBILITY is that it might turn itself off after some predetermined number of restarts - but that's just a thought that I saw no data to support.

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