how to freeze frame for 3 seconds in camtasia 3

The only problem with replacing it is that you don’t have any O2 sensor codes. Oxygen sensors are cheaper than catalytic converters, so there is a possible starting point. No, it shouldn’t have anything to do with your P0420 code.

What speed do you usually drive on that road? Answer those questions and you will know if short or long term fuel injector trim is something to consider. I noticed that your speed was 52 MPH when the MIL came on. Long term fuel injector trim would only be happening if you were not accelerating when the MIL came on. It looks like the problem is the catalytic converter because you have no O2 sensor codes. There are some pictures with this article that may clarify things a bit. Whether you can tell anything when you see the signal is a different question. Or you can find the signal wire in the wiring harness, push a pin into it, and watch the signal on an analog (not digital) voltmeter. I’m pretty sure that some expensive OBD2 readers as well as some of the inexpensive computer based ones can monitor the O2 sensors in real time. But if the catalytic converter is working properly, they will not be seen (be much reduced?) at the downstream sensor. You should see these variations at the upstream O2 sensor. What’s supposed to happen is that the computer continuously adjusts the amount of Oxygen in the fuel mix. I’m not an expert on this, but I think what you need is not the freeze frame data, but the readings over a few seconds at the downstream (rear) O2 sensor. This is when it gets a little complicated.

How to tell? A gas analyser could read the exhaust gases at the tail pipe or, the signals from the oxygen sensors could be observed and evaluated. If the oxygen sensor(s) is (aren’t) reading correctly, code P0420 may be set erroneously.

Therefore, the cc isn’t catalyzing as it should, and is “below efficiency”. When it does, the oxygen didn’t combine (through catalytic action) with any fuel when going through the cc. At the rear of the cc, the rear oxygen sensor should not have any oxygen to measure. The oxygen, in the exhaust gases at the front of the cc, should be combine with any unburned fuel in the cc on its way through the cc. The code P0420 for, “catalytic converter (cc)efficiency too low”, is from the comparison of the signals from the front (of the cc) oxygen sensor to the signals from the rear (of the cc). You want to record the freeze frame data because it can contain information which MAY help you in a solution to the problem. They will indicate if the engine is running rich or lean. The fuel trims won’t indicate the health of the catalytic converter. The freeze frame data is set when the trouble code is set.

How to freeze frame for 3 seconds in camtasia 3