My Aristo swapped single 2000 GS300 has been acting up lately with hard starts when engine is cold and misfire on boost. But the last couple weeks it just died and would not idle and bad misfire. At first I thought ignition, so I swapped out the sparks but that didn't work. Next I swapped all the coil packs with new oem Denso units and NGK plug wires but that still didn't work.

Then the other day when I was gonna move it out of garage to have it towed to my friends shop and also have my friend who tunes HKS Fcon look at my car, it started up fine and running back to normal. My car is running HKS Fcon V pro with HKS knock amp. Told my friend the symptoms and he thinks it might be my O2 sensor gone bad.

So I pulled the o2 sensor but I don't know what replacement part I would need. It's a Bosch with stamping of 0258986617 and I searched online but can't find the part number. Anyone have any idea?

 

I dont get the problem here I googled "0258986617" and got a million results anywhere from ebay to Amazon.




http://www.ebay.com/sch/i.html?_from...86617&_sacat=0

 

Same results for me!

 

Denso O2 sensor part numbers are:

(1,2,3 precat) Bank 1 Sensor 1: 234-4048

(1,2,3 postcat) Bank 1 Sensor 2: 234-4626

(4,5,6 precat) Bank 2 Sensor 1: 234-4630

(4,5,6 postcat) Bank 2 Sensor 2: 234-4603 / Toyota# 89465-30490