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Joe's '91 405 Mi16...


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In that case it's an easy fix, try changing the oil temp sensor, its the one next to the oil drain plug on the oil pan. They are cheap, if that doesn't fix it, you can add resistors to the wire from the sensor to add or subtract resistance, with that lower the gauge reading.

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Hey guys, was able to get the car up on my lift today and figure some things out. For starters, the connection to my oil temperature sensor was fine, no corrosion, just a little bit of oil, so I disconnected and cleaned everything, and put it back together snug. Took it for a drive this evening and all the same symptoms.

Another thing I noticed is that the oil level gauge is quite erratic too. When you turn the ignition on, it gives you a reading on the gauge, if I turn it off and then turn it back on again I get a completely different reading, and so on and so forth. So it just seems like the sensor is bad at this point.

I spoke to Brian Holm, but he doesn't have any in stock and cannot get one for at least six weeks. Anyone else know where I can get a sensor in the meantime? I checked all the regular places I would normally check, but no luck…

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Those oil level gauges were next to useless when the car was nearly new so I'd simply ignore it and enjoy the temp. gauge.

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I can’t see it taking much effort to ensure they work properly, so why not see if it can be made accurate?

The resistance of the sensor should be easy to test, usually the higher the resistance the higher the temperature indication, but making sure it’s within spec is the first think I’d do since issue could be gauge side.  If it’s a single wire connection you may want to check and clean engine grounds as well to ensure pan is nicely grounded.

There’s a Vendor section on the site as well, either Madhu or Rob in Texas would be good to check with.

Rabin

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12 hours ago, Mike T said:

Those oil level gauges were next to useless when the car was nearly new so I'd simply ignore it and enjoy the temp. gauge.

I agree, I'm not too concerned about the oil level gauge, that's simple enough to check on my own...

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1 hour ago, Bean said:

I can’t see it taking much effort to ensure they work properly, so why not see if it can be made accurate?

The resistance of the sensor should be easy to test, usually the higher the resistance the higher the temperature indication, but making sure it’s within spec is the first think I’d do since issue could be gauge side.  If it’s a single wire connection you may want to check and clean engine grounds as well to ensure pan is nicely grounded.

There’s a Vendor section on the site as well, either Madhu or Rob in Texas would be good to check with.

Rabin

Fair point, I already cleaned everything at the sensor, might have to go up and check it at the block.

Also I'm not sure what the resistance should even be on the sensor, anyone have that information?

Lastly, electrical is not my specialty. I have a multimeter but can't even remember the last time I used it. Also not sure which setting I should be checking it on. Any help with these matters would be most appreciative…

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Rob Courter is Javel Garage in the vender section on the home page.  
 

To check the resistance you set the multimeter to ohms and check the reading from where the wire connects to the body of the sensor or it’s ground.  If you Google the sensor you often will find the specs for it as well.

FSM should have that info, but I don’t think I have any 405 manuals.

Rabin

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When my 405 was nearly new it gave wonky oil level readings (I'm talking about 30,000 km under warranty) and I was told at the dealer that the sensors/gauges were crappy and not accurate at all.  As the car aged it got worse but it's not worth wasting any further thought about it IMO.

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If my experience with the local Peugeot dealer in the late 80’s was anything to go by, they were ridiculously undertrained Dodge/Plymouth/Chrysler dealership dudes that had little to no interest in these cars.  
 

In my experience that’s usually the response one gets when they have no idea how to fix it and really just want you to concede and accept the flaw.  :)

Temp and level should be dead simple to suss out, but I’m likely too OCD to not let that bug me. 
 

Rabin

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Thanks for the information guys, I obviously have some more stuff to figure out here...

I guess I never realized that the oil temperature sensor acted alone, and the oil level sensor is a different one altogether. I never considered that the gauge could be an issue, but now it seems like that is another potential here… 

Still looking for the specs on the oil temperature sensor, but I should be able to find it. I'll also check the connections at the block for both sensors and go from there...

Will update soon, and thanks again, you guys are the best...

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