All Things Mk5 > How to Guides / Troubleshooting

02 Sensor Issues After downpipe & map

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briank213:

--- Quote from: rich83 on November 10, 2021, 10:00:19 am ---Don't use a spacer. Buy a genuine Bosch sensor. They do fail, mine did a year or so ago.

Those torque figures are nonsense too. No way it's making 440ftlbs

--- End quote ---
I agree with him they put a spacer on my car it completely messed my car up cause the ECM uses the information from O2 sensor to control the fueling on the car especially the one near the turbo that's the bank 1 sensor. After replacing the O2 sensor with Bosch one and removing the spacer all the issues I had on car went away and now my car is running strong making 247 hp and 283 ft.lb torque at the wheels

briank213:

--- Quote from: rich83 on November 10, 2021, 10:00:19 am ---Don't use a spacer. Buy a genuine Bosch sensor. They do fail, mine did a year or so ago.

Those torque figures are nonsense too. No way it's making 440ftlbs

--- End quote ---
The torque is way to high for stage 1 tune with dp and intake with my Apr stage 1 tune my car made 283 ft.lb at the wheels.

pudding:
Just to clarify on the O2 sitch.....

B1-S1 = Primary sensor.  This one does all the fuel adjustments. Fitted in the downpipe upstream of Cat 1.
B1-S2 = Secondary sensor. This one measures catalyst efficiency. Fitted in the exhaust downstream of Cat 2.

B = Bank.  B1 and B2 refer to the cylinder bank number, so the TFSI will only ever have B1.  R32, V6 and V8s will have B1 and B2.
S = Sensor.

Never, ever fit a spacer to B1, S1.

If you really must use one, fit it to B1, S2.

All decats will trigger a B1, S2 catalyst efficiency fault code and a CEL. 

Some Stage 1 remaps will also cause the same, but not always immediately.

Stage 2 and above remaps code out B1,S2 completely.

B1,S2's job is to make sure the cats are doing their job, but since it's downstream of BOTH cats, you don't know which one is buggered. A bit of a sh1t design really.

Not sure what's going on with that dyno plot, it just looks weird.  Might have been an early run trying to dial in the N75.  That is one humungous boost spike.  Piston cracking cylinder pressures if that number was legit.

NorthWest:
cheers for clearing up 02 topic mate appreciate it !!

in regards to map..I contact the company who done it. he has good reputation over here in the republic!

He said the torque figure was measured in n.m . converts to 323 foot pound on google?

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