Review on Engine Oil Pressure Sensor Trailblazer by Jared Winebrenner

(11/12/2019) The check engine light came on and the oil pressure gauge showed no oil pressure, but the engine ran fine (although I shut it off immediately when it happened) . The light came on and the oil pressure showed zero!) An OBD2 scan showed codes P0521 (engine oil pressure sensor operation) and P0523 (engine oil pressure sensor circuit high voltage). That gave me the certainty that it was just a sensor. I decided to try this part as it was significantly cheaper than the OEM GM part and looked almost identical. Also had a review from someone with a 2010 6.2 liter engine and it worked for him. The dealer wanted $87 for a Delco GM/AC sensor part. Prices online were around $45 for a GM/AC Delco part. It was $18 after a $2 coupon and was sent "1 Day Prime". It might not last as long as the original (which lasted 10 years and 113,000 miles), but I probably don't need it. While it works well, maybe even better than the native sensor. The original showed about 40psi with the engine on and didn't really move as the engine speed changed. The new gauge shows about 25 psi at low idle (500 rpm), about 40 psi at 1200-1500 rpm, and fluctuates to about 60 psi when the engine is running at 2500-3000 rpm It seems to me " to be more correct" - the pressure varies somewhat depending on the engine speed. The GM dealer quoted me about $500 worth of parts and labor to fix it. Another local non-dealer mechanic, quoting based only on "stock book" times and parts only, quoted me over $625! That's just nonsense, even assuming the intake manifold is removed, new gaskets and pressure sensor, and reassembled. Nuts. But I did find an ASE certified mechanic who appears to be honest (judging by many reviews) and isn't a "book book" price tag. He quoted me $100 labor if he could do it without removing the air intake, or $200 labor if he had to remove the air intake, and $60 for the air intake gaskets. He installed it without removing anything except the engine top cover, without removing the air intake and used this part I provided and ended up only charging me $80. He showed me the tool he used (sorry I didn't take a picture). It was a deep sleeve that he shortened a bit and then welded on top, plus a small extension and a swivel extension. A kind of customization. He said the oil pressure lines were too long. I bet he did it in 10 minutes max and he's done it probably 500 times on different Chevy/GM vehicles. But I was happy to pay him $80 for it even though I knew it. I tried a couple of times but couldn't get the hoses off, I felt like I had to get out and it was difficult to get to them. The "correct" way to ensure you can see what you're doing and correctly tighten the sensor to spec is to remove the intake manifold entirely. But this method works well for many people. If you want to do this on your 6.2L there is a great YouTube video from 1A Auto Parts called "Replacing an Oil Pressure Sensor 09-14 Chevy Suburban 1500" that shows the whole process of removing the intake and replacing the sensor on the engine 6.2l. Two pluses to watching if you do it yourself: 1 - It's sharp and well narrated and you can see how to disconnect everything including fuel lines (make sure the pressure is released) and various quick couplers which are a headache . It names all the pieces it removes, so if you're not sure what those things are, you'll know! Unlike most videos on YouTube which are made by an idiot with an iPhone in one hand trying to fix it with the other. 2. You can see exactly where the sensor is and what it looks like when NOT buried. If you do it yourself, I recommend taking 30 minutes to look at it. Much luck!