Anyone know what all can make the oil light pop on? 01 Jetta TDI... its momentarily poped on twice now and both times i immediately stopped and checked the dipstick... but the level is fine (even after sitting for 10-15 mins.....) any experience??
Most of the time it is actually a bad sender, and not a loss of oil pressure. However, only way to know for sure is to actually put a gauge on the engine. However, it is pretty quick and easy and inexpensive to just put a new sender in place.
yes. All it does is short the single wire to ground (the body of the sender).
When the sender sees pressure, it makes the ground connection.
When the sender sees no pressure, it opens. That way, if the wire happens to get broken, the light would come on. In other words, it's designed such that the sender must be making connection to tell the system everything is ok. Problem is... if it's an intermittent issue, the test can become moot.
Unless the filter canister was leaking oil, I don't think the loose cap would have anything to do with lack of pressure indicator light coming on.Just wanted to pop in and thank those who helped - I just got the oil light and freaked out. Checked oil level, good, no leaking going on, jumped on here.
Of course, when this was happening, it was at night (dark) and nothing looked out of the ordinary. After my oil pressure sensor was delivered, I went to install it, and found that the oil filter cap was very loose.
Went ahead and replaced the AZAutoHaus sourced sensor, anyway, but I'm thinking the old sensor was just fine.
Just another thing to check for, if someone else runs into this same problem!
Not that I'm sensitive about it but this product will ship by our Economy method for $1.17. Priority Mail is $6.04 and will get to the midwest in two days.http://www.idparts.com/catalog/product_info.php?products_id=390
Costs $9- the shipping will probably double that!
First I have heard of this. I guess if mines not leaking it is still in good shape? I assume any loss of pressure due to the oil cooler gasket would be obvious?Did you check the oil cooler gasket. These get hard and start leaking, they blow out after ten years. When they blow out you will lose your oil and pressure also all your oil will end up somewhere down the highway. Some times they go at strange times. (Please research this I am not kidding.) I am a Volkswagen freak and this is one of our big peaves. We consider it normal maintanance to change these gaskets. Easy to replace cost is $3.95 or so. Just replace it, its worth it. Sometimes the gaskets crack and leak intermediatly could cause a sudden drop in oil pressure the cooler is just below sensor on filter. There is a jam nut that holds the cooler on, remove this and lower cooler with hoses attached. The gasket is between oil filter and cooler. Wait on TDI there is a square like nut that protudes down that holds the cooler on. On the gassers its a jam nut. There will be oil around the top of cooler if bad. Its a round gasket with little alighnment tabs these are the improved ones. Just a tip if your working in that area.