P2019A error code

Mozambique

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Gap IID arrived today!
P219A has returned twice. No other DTC's. Will nose around with it and check the items you suggest. Nice to see MAF air mass numbers same for both sensors. That code has not returned after I replaced one sensor. Awesome little tool!!
 

Mozambique

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So I used the Gap IID to check out O2 sensor outputs and rail pressure é trim as you suggested. Trying to decode the results:
 

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Mozambique

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Looks like something up with O2 sensor(s).
 

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Mozambique

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Fuel rail pressure - not sure what this is telling me?
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Mozambique

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Some misfire activity......... but nothing obvious when driving?
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Mozambique

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Last one is fuel trim....... again, not sure what this may be telling me?
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jlglr4

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First off, fuel pressure, o2 sensors, and fuel trim are all values that should be measured with the engine running and warm. If the engine is cold, it will be in open-loop fuel control (not running on a feedback loop) and the values will not read correctly.

The other thing to know is that the gap tool has a lot of fields that appear to be very similar. I have found that some of these fields work and others do not - and I believe some work for the 2014-2016 cars, and others work for the earlier cars. So, in my experience, there is a bit of trial and error with the tool.

Another general tip - when you’re reading live values, things are usually moving a bit. Fuel pressure will fluctuate, short term fuel trim will fluctuate, o2 sensor voltage should fluctuate, airflow will fluctuate. I have had the gap tool freeze on me periodically. So, blip the throttle a bit once in a while to make sure the readings are still live.

Finally, it’s always useful to have RPM up for just about every reading (that RPM in the upper right corner I find freezes up a lot and is not a substitute). You can create quick menus and just add RPM to everything.

For fuel rail pressure, if your engine is running, the desired rail pressure should not be zero. It’s possible this field is not active on your vehicle - not sure as I have the later model car. You also should have two rail pressure values for the two banks. If you can get the desired rail pressure up, actual rail pressure should be close to desired.

For fuel trims, try to find the fields titled “Long term fuel trim bank 1” and ”Short term fuel trim bank 1” (same for bank 2) without reference to oxygen sensor etc. They should read out in % format. These are the main readings to use.

For o2 sensors, I usually use a field that references the sensor voltage. Sensor 1 voltage should move smoothly between about 0.1 and 0.9 v, back and forth like a wave. Sensor 2 (post-cat) should be steady around 0.5-0.7v if I remember correctly.

I agree your readings above show a problem with the o2 sensor. It’s a heated sensor, and the duty cycle is not showing any heating going on in the bank 1 sensor. Your equivalency readings also show a rich condition on bank 1 (if the o2 sensor is to be believed).

I would try to pull the o2 sensor voltage readings and see what they look like. Thinking sensor 1 bank 1 might be shot.
 

Mozambique

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Hey, thanks. Yes engine was warm. Some of readings different from when I tried it yesterday, so figured there may be some variability based on Gap IID connectivity issues etc.
Will look for the O2 sensor voltage readings as you suggest.
O2 sensors should always be replaced in pairs - right?
Any idea what sensor 1 bank 1 relates to re. Upstream L and R and downstream L and R O2 sensors?
 

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Kept the revs at 3,000 and desired rail pressure value came on briefly
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Mozambique

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Could only find sensor 2 output in volts?
 

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