Recently got this error on my 2013 RDX. Checked the oil level, it was fine but topped it off anyway. Checked for oil leaks, didn't find any. Tested both pressure switches off the car with a multimeter and air pressure. Found that the one in the front of the engine (one next to the oil dipstick) was bad. Multimeter did not register any resistance changes from the open circuit status when compressed air is blown into the sensor. The one from the back of the engine closer to the firewall tested OK with various resistance values, and NO resistance when the air pressure was at max.

So i ordered a replacement sensor/switch from Amazon (part number: 37240-R70-A04), tested it the same way to see that it is working (it was) and installed it. The car still shows the error code and the oil light is still ON after a few minutes of running the engine at idle, and after a very short test trip..

I repeated the switch tests this time on the car and i tested both the new one and the old good one. Removed the connectors from both switches and started the car, tested each switch for resistance changes, neither one showed any change from the open circuit status, both remaining at open circuit at idle as well as at 2000 rpm. It looks as if the engine has zero oil pressure!!. Am I missing something here? Should I also do an oil pressure check with a manual oil pressure checker? And I am almost due for an oil change too, I wonder if new oil would make any difference!.

By the way there are no strange noises coming out of the engine when i start the car, in fact it feels and sounds just like before the problem surfaced.

 

First buy oil pressure gauge and check oil pressure https://www.harborfreight.com/engine...oaAsT_EALw_wcB

 

Just noodling here, but did you use a scanning tool and clear the codes after installing the new sensor ? I wouldn't drive the car agin until this problem is fixed. You can drive around and think all is fine , while wearing down rod and main cap bearings.

 

I tried to clear the code after changing the switch but it does not clear. I am not driving the car right now. Today I changed the oil and the filter. It was due anyway and I thought maybe a bad oil filter is blocking oil flow, but that didn't make any difference either. Checked under the car while i was changing the oil and there seems to be no oil leaks of any sorts. A leaking oil pump apparently would have oil around the oil filter housing and in the neighboorhood. I double checked the old pressure switch today, it does actually seem to be working OK with air pressure test. So the problem isn't the switches, unless there is another one that I am not aware of.

 

If the Low Oil Pressure indicator is on, then there is no sense in clear the DTC.

 

Yeah, I ordered one and receiving it tomorrow. Do you know what kind of pressure (psi) i should see? in other words, what is the normal oil pressure at idle and at a given rpm for this engine?

 

 

Thank you, I appreciate the information. I was really concentrating on the other 2 pressure switches (the ones that are under the hood on each bank of the engine - Single Wire Switches. I used the manual pressure gauge I received from Amazon today on those switch housings, and the gauge registered no Pressure at all (zero). I then started thinking about the third switch that is on the oil filter housing - this one has 3 wires ( this is the one shown on the guide you posted above). Tomorrow I'll do the pressure test on that one and see what I get.

 

Today, I checked the pressure on that 3rd port near the oil filter and the readings are within the specifications. I also made a big oil mess when I turned the ignition ON by mistake when the switch was uninstalled and before i hooked up the pressure meter. (got the stupidity award for this one for sure!!), luckyly i had a big bag of sand to contain the damage before it spilled all over the whole driveway!!.. Anyway, the oil pressure is about 15psi at idle (650 rpm) and just about 80 psi at just over 3000 rpm. So it is now either the oil pressure switch or the wiring at fault. Checked the fuse (The one labelled "Oil Level" in the fuse box under the hood - 15A) and it is OK. However I can not read any voltage on the red wire of the pressure switch whether the ignition is ON or OFF. There supposed to be a reference voltage on that red wire, but I am not sure when it is supposed to be present and how many volts.

Now I can buy a new switch and hope that will fix the problem or wait till i figure out how to diagnose the wiring, but I am hugely relieved that there's no leak/damage on the oil pump and i don't really have to get to the oil pump to fix things. By the way, a big thanks goes to @altair47 for his helpful replies.

 

I meant 7.5A not 15A, but "Oil Level" seems to be a misnomer for this fuse, as it has probably very little to do with the actual oil level in the car.

 

I'm glad that the oil pressure is fine and the engine was not damaged

 

Yeah, no damage other than the oil spill on my driveway . Yesterday, I said, "oh what the heck, I'll buy that $15 replacement switch from Amazon and see if it fixes the problem rather than me trying to diagnose the wiring, and lo and behold that cheap sensor marketed as the FUEL LINE pressure switch and that looked exactly the same as my OEM Oil pressure switch fixed the error code. This part sells for $218 at Acura Parts Warehouse, compare that to $15!!. OK mine is not the OEM part but no one can actually tell whether it is made better or worse than the OEM part, and whether it will last as long (10 years) but they look and feel exactly the same except the cheap one has no brand or any markings on it while the OEM one is a DENSO switch. In any case now that I know how to replace it, i can always get an OEM one if this one doesn't last long enough.

 

Hi what was the part number that you bought on Amazon and which sensor was the one that fix the error code. Was it the one by the oil filter?

 

If you look at the picture the OP provided the sensor on the left is the Acura OEM Denso part #499000-7931.

If you google that Denso part #499000-7931, it ties back to #12 Oil pressure sensor on the Acura parts diagram below.
In addition, it is the only sensor near the oil filter base that is close in dollar amount ($218) to the one OP refers to in post #12.