k so i first replaced my front 02 sensor and cel came back on ....
with p0133 and low circuit response
so i rereplaced my front 02 sensor with bosch universal
cel back on p0133
replaced my rear 02 sensor
cel back on
same code
i also cleaned my tb and MAF
\

my registration expired yesterday and i need to pass emmisions!!!

any other suggestions or options??

2001 volvo s40 91000miles

 

Did you ever use an OEM sensor?

 

just bought a oem sensor today and slaped it in the front...
erased cel and drove..
cel came back on with same code p0133

it sucks ive spent like 400 on 02 sensors!!!!!

any hunches??

 

And it had the harness adapter on it?
Any vaccum leaks?

 

P0133 is bank 1 sensor 1 O2 sensor. I replaced this same front and before-cat sensor with OEM sensor. P0133 keeps coming back.

I'd rather not go through what chimmy's gone through and replace the rear O2 sensor and the MAF and possibly more.

Harness adapter included and no vacuum leaks.

Any suggestions?

 

May I ask as I'm having the same issue latelly that how did you get the harness adapter and if also had to get the ECU flashed with new program?

 

This for the 2000-2004.5 cars with the 1.9L Turbo engine. Has everyone had the recall ECM flash done and the O2 sensor adapter harness installed? The stock O2 sensor harness has 2 wires reversed. The dealer adds a short harness between the car and the O2 sensor that makes the wiring correct. This additional harness does not come with the O2 sensor.

2001 S40 with 160,000 miles.

 

I already had the old mini harness and it fits the new Bosch OEM O2 sensor fine.

Keep em coming!

So far, I've replaced MAF sensor, flex pipe, checked for exhaust leak, new cat, tuned it up myself, went to dealer for ECM flash/update and now I'm about to burn trash this car or donate it to Goodwill.

What else can I do?

 

Like I said earlier you need the harness and also a new program on the ECU so it will not look for the signal that fast.See the dealer as its their job.Could you post a pic of that harnes it must be more to it like the two wire reversed.Thanks.

 

I went to the volvo dealership and they provided me with the harness. The p0133 came back. So I changed the O2 sensor yet again. The code came back yet again, then I read here about the ECU flash. I went back to the dealership and asked them about the ECU, and they refused to flash it telling me that they only give the harness to solve the problem.

Is there any advise anyone here could give me to help solve the issue here?

 

yes, they gave me the same BS!

i ended up buying a OBD2 scanner from walmart and reset the ECU (engine computer) manually. that was it! volvo dealers are the worst.

1. change the correct 02 sensor, bank 1 or bank 2. bank 1 is easy. i borrowed an O2 sensor nut from autozone and used some elbow grease to get the O2 sensor off. replaced with new Bosch O2 sensor from dealer.

2. reset the code with "borrowed" OBD2 scanner from walmart. i returned OBD2 sensor back to walmart.