99 gp gt

99 gp gt 3800. My scanner keeps reading codes po133(o2 circuit slow response bank 1 sensor 1) and p1133(HO2s/O2S insufficient switching sensor 1 bank 1).I just changed both 02 sensors and EGR. Could MAF cause these codes also? Or did I possibly get a bum Bosch O2 sensor?

Might check for possible wiring problem before you start swaping parts.

O2 sensor wiring?

I assume you reset the codes after installing the new sensors? If you did, then strike up another junk Bosch oxygen sensor.

Exhaust leaks will also generate both of the codes, make sure the sensor is screwed all the way in and tight. I would also try swapping it out as well.

I assume you reset the codes after installing the new sensors? If you did, then strike up another junk Bosch oxygen sensor.

AH HA HA HA HA HA HA :lol:

If you did, then strike up another junk Bosch oxygen sensor.

QTF!!!!!

"Quoted for truth"

Stick with the AC Delco or Denso brands only. :2cents:

denso? never heard of them, they make 02 sensors too?

denso? never heard of them, they make 02 sensors too?

Japanese up there with NGK as far as quality and performance. A lot of L67 and L36 owners use them. I use the Denso in my GTP and AC Delco in the others. I think the W Body Store still has them available for around $60.00.

Good to know....