12-12-08, 02:46 PM
Have a 1998 Deville, with 78K miles, at 60K, I had encountered the PO153 code (HO2S Slow Response Bank 2 Sensor 1) had the bank 2 sensor 1 02 sensor replaced with a Bosche.
Then at 70K, another PO153, this time I replaced the same Bank 2 sensor 1 (Bosche).
At 77K, another PO153, cleared the code, then at 77.3, PO153, cleared the code, then at 78K, PO153.
Any advice here?
In advance, thanks . ..
12-12-08, 02:52 PM
Need to add, I had a bad Fuel Pressure Regulator (Great diagnosis from Ranger - many thanks), which was leaking gas into the intake vacuum.
I just replaced it 100 miles ago, and removed the pos bat for 2 hours, to allow the computer to reset the fuel settings.
I am wondering if the leaky FPR was causing problems on my 02 sensor?
12-12-08, 02:58 PM
By your statement, the FPR may have been your problem all along. O2 sensors react to rich and lean mixtures, so a rich condition caused by a raw fuel leak would surely mess up the air/fuel ratios and therefore the "expected" values set into the O2 sensor specs.
Your problem might be Bosche. I would have recommended you stick with A/C Delco.
12-12-08, 04:00 PM
Ranger, why do you recommend AC/Delco over Bosche?
I was told the Bosche was OEM replacement . . .
And why do think it might be the BOsche?
12-12-08, 04:57 PM
Many forum members have reported bad results with Bosche stuff.
12-12-08, 06:24 PM
(Robert) Bosch equipment is "OEM style". Original is Delphi or ACDelco. BUT, what company actually made the sensor is the mystery........
From what I've heard, most Bosche part do not play well with Northstars.
12-13-08, 07:55 AM
The Bosch sensors are made for multiple applications, while in theory they should work the same no matter what they are in, who knows?
I have seen a lot of Bosch replacements fail, N*'s do not like Bosch plugs for sure.
That code should be an actual sensor malfunction, a specific set of conditions need to be met for that code to set.
The only really important thing to remember is that Bank 2 is the front bank on a N*.
Some people think it is the rear one.
I don't see a lot of Delco part failures on O2 sensors, seems like buying one factory one would be cheaper than buying 3 Bosch parts.