Tricking O2 Sensors - Got a Result

Along with this issue, is there any detriment to the motor or performance driving with P0431/0421 and the CEL on? Sometimes I'll drive for a day or two without resetting them.

 

If it were me I would remove the steel wool and plot all 4 O2 sensor outputs (right and left bank, pre and post cat) to see exactly what is going on.

You should also run the Freeze Frame data to see what conditions were happening when the codes were set.

By reflashing the ECU I assume you meant erasing the codes (as you do not have to reflash the ECU to reset codes)

 

I've now driven over 200 miles since Steve and I reflashed my software mapping with Zero issues and No CEL from the Below Threshold error.

Give him a call buddy, he's got it licked! I've been down that road and driving the car is what we want to do, not try to figure it out....the extenders and mini cats don't work, period.

 

With headers and high flow cats on 430, I was getting a P0430.

What worked for me was the extenders plus the bigdaddie mini cat. 1000 miles without a code.

 

The secondary o2 sensor is operated normally in a couple different manners. The secondary o2’s internal resistance prevents it from generating signals when it’s ‘cool’ (usually below 360 degrees C). The sensor heats up by both an internal heater and the exhaust gas. Then depending upon the content reading of the sensor, the ECU looks for certain mV’s from the secondary o2 sensor. A low activity type of code usually indicates the signal is too steady. The cycle of the sensor is how the ECU determines the Catalytic Converter Efficiency.

So essentially it could be throwing different types of codes depending upon the temperature its actually reaching, the cycle of the signal, and the mV’s its outputting.

Ecus across the make/model spectrum are programmed differently dependant on many factors, some are more sensitive than others. Also many different cars use different types of o2 sensors, and they might warm up/read differently when trying to use the ‘defouler’ approach to fooling it which is why sometimes it works on some cars, but not on others.

As djastral69 pointed out, I’ve figured out how to program the ECU to stop the error checking so that the ECU will not throw any CELs for lack of the correct secondary o2 signal.

Regards,
Mase

 

Mase,

How do you tune the ECU?

Is it a desensitizing of the sensor, an open loop tune, disable the monitor, etc?

Thanks

 

HighandDry

Most of what we do for tuning lies in the performance of the ECU’s calibration in terms of gains of horsepower/torque and drivability/throttle response increases, however recently more people were wanting to have their CEL’s disabled from running ‘off road’ exhaust applications as well, so we’ve developed a many different tunes for several makes and models. For the 360 and 430 tunes we have: performance, performance with the addition of disabling secondary o2 codes, and a tune that only disables the secondary o2 codes. The ECU tunes are flashed by me in person or the ECUs are sent to me in Florida. We go in and read the factory calibration on each ECU, and then modify it from there.

To disable the secondary o2 codes, we go in and change the Diagnostic Trouble Code error checking portion of the programming code (which is tricky finding the DTC block where the DTC error code is stored).

Normally you don’t want to engage the ECU to switching to open loop, as then the ECU will not adjust any fuel trims under rich/lean conditions the engine might be operating at.

If you have any further questions, please let me know!

Mase

 

Give Steve Mase at Mase engineering a call, he knows how to get into ferrari 360 or 430 cpu and get the P codes flashed and never return. I have tried everything else, from extenders, to big daddy mini cat, to oxygen sensor simulators, believe me they DO NOT WORK. He is a young engineer with a wealth of knowledge when it comes down to get maximum hp from your engine. Several racing teams entrust their race cars to him. He has also put my 360 on his dyno and got 30 extra hp by programming my cpu. He is the wizard of the cpu.

 

on my post from yesterday i referred to the ecu as cpu sorry about that. By the way my 360 has fabspeed headers fabspeed cat bypass pipe and capristo level 3 exhaust sistem. music to my ears.

 

I went for a trip of 700 miles in my F430 with fabspeed headers and after 30 minutes I got the cel, I erase it a few times but came back maybe within 15 minutes.

I have extenders but I haven't installed those because I feel it is a waste of time.

I will look into remap but for sure I will have to send the ecu because my car is in the middle of nowhere...

 

Add the bigdaddies with the extenders.

Now 6K miles without a code.