p0133 (o2ckt slow response, bank1 sensor1)

pburnhamb · Post by **pburnhamb** » 18 Oct 2011, 16:22

i will do this again. i am not exactly sure what i can get rid of also now that i have deleated the secondary air system tho.

Post by **jblackburn** » 18 Oct 2011, 16:48

A can of carb cleaner will help you find any leaks. Spray it around vacuum lines and listen for any changes in engine idle speed.

I'm not familiar with what all the SAS delete procedure actually bypasses with the ECU - whether it just fools the O2 sensor or if it will get mad if the valve on the radiator shroud for the system is unplugged and removed.

pburnhamb · Post by **pburnhamb** » 19 Oct 2011, 23:44

so i was talkin with a friend of mine today (he works at a euro car shop) and he said off the top of his head he remembered something about needing an updated harness on the 98+/- year v70. he said the harness clips into the main one for the O2 sensor and then the other end goes to the O2 sensor.......made no sense to me because both of the ends are the same......but mybe it switches where some of the wires are located in the harness....?? in any case i did see a note on the eeuroparts website ( http://www.eeuroparts.com/Main/PartsResults.aspx ) when i clcked on the front oxygen sensor, it has a note saying it needs the upated harness/ harnesses........ anyone have any clue about this?????? anyone have one of these "updated harnesses to look at? it looks to only be about 8 inches long. thank you. im gonna solve this 2 month battle ieven if it bankrupts and kills me....gulp

Post by **jblackburn** » 20 Oct 2011, 08:41

My 1998 doesn't have one and I've never had a problem.

The harness is to keep oil that will inevitably drip down onto the sensor plug from the turbo/rear cam seal area from messing it or readings up.

pburnhamb · Post by **pburnhamb** » 20 Oct 2011, 10:44

how would this 8 inch harness achieve that? it doesnt change how far from the 02 sensor there is a plug, or how gar from the harness there is a plug, it seems to me that it just adds an extra connection. is it suposed to be able to be moved out of the way with 8 more inches or something?? weird. that wouldnt change the resistance or something too wouldit?

Post by **jblackburn** » 20 Oct 2011, 11:21

As I understand, they breathe through the wire harness in a way. That extension helps keep oil from getting into there.

jimmy57 wrote:Some 850 Turbo's have this bad habit of getting oil into harness for o2s. The heated crankcase vent nipple at turbo inlet hose cracks and the ground to that is common to o2s. The connectors have seals and all that stuff done to keep water out also does great at keeping oil in. The oxygen sensor gets its reference oxygen through the connector. If oil is there the oil coats the ceramic tip of the sensor from the inside and chokes it and it gets funky and then quits.
Unplug connector and use a Q tip to check for oil. If it is there you need another sensor and this time get the adapter harness from Volvo that isolates the sensor connector from the car's harness.
If no oil then make sure the connector terminals are good. Poor ground to sensor will make it come n go. The ground for heater and ground for sensor signal circuit are different wires and are isolated from each other.

pburnhamb · Post by **pburnhamb** » 20 Oct 2011, 18:05

would i get code 0133 if my cat converter was bad? i put those 2, 8 inch extensions on today and poped the 0133 code again. this is madness i tell you, madness.... btw, i worked in blacksburg va for a couple years, a couple of years ago. what do you do there? thanks for helping me too. i WILL get to the bottom of this.

Post by **jblackburn** » 20 Oct 2011, 20:40

I work down in Radford for the regional planning commission.

Like I said before, some kind of leak is causing that code. Vacuum, intake air hose, or exhaust leak. The sensor reading is not corresponding quickly enough to the amount of air showing at the mass airflow sensor.

The hard part is tracking it down. If you can't find anything, one option would be to take it to a shop and have them put a smoke machine on the intake.

pburnhamb · Post by **pburnhamb** » 21 Oct 2011, 14:00

yeah i think im gonna have to use a smoke machine. will keep u updated. yeah i used to live on main st in radford. right above the coffee mill. tks

gilhuly · Post by **gilhuly** » 21 Oct 2011, 18:07

Read in Jimmy's post referring to the common ground for the "heated crankcase vent nipple" and the O2 sensor. If this ground happens to be flaky this could be a problem affecting the O2 sensor.

jblackburn wrote:As I understand, they breathe through the wire harness in a way. That extension helps keep oil from getting into there.

jimmy57 wrote:Some 850 Turbo's have this bad habit of getting oil into harness for o2s. The heated crankcase vent nipple at turbo inlet hose cracks and the ground to that is common to o2s. The connectors have seals and all that stuff done to keep water out also does great at keeping oil in. The oxygen sensor gets its reference oxygen through the connector. If oil is there the oil coats the ceramic tip of the sensor from the inside and chokes it and it gets funky and then quits.
Unplug connector and use a Q tip to check for oil. If it is there you need another sensor and this time get the adapter harness from Volvo that isolates the sensor connector from the car's harness.
If no oil then make sure the connector terminals are good. Poor ground to sensor will make it come n go. The ground for heater and ground for sensor signal circuit are different wires and are isolated from each other.

p0133 (o2ckt slow response, bank1 sensor1)

Re: p0133 (o2ckt slow response, bank1 sensor1)