O2 sensor
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O2 sensor
I replaced my 2016 Audi truck Q5 premium plus quattro O2 sensor with a Bosch sensor from AutoZone. I was getting 6 o2 sensor related codes but now after the fix I am still getting a P3030d "Cold start valve open circuit" code. I had that code before as well, Googling it says that it is related to O2 sensor. So do I go to dealership and get the actual part? And will that make a difference in this case?
Thanks to anyone who takes the time to answer.
Thanks to anyone who takes the time to answer.
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Joined: Dec 2001
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From: Georgia
No, that error has nothing to do with the lambda sensor. "cold start valve" is the 5th injector in the intake manifold, used the E85 cold starting where the direct injectors do not flow enough for E85 cold ignition. I have no idea if it's common for that injector to fail resulting in a P303D, of it's more likely a wiring issue. But nothing to do with the O2 sensor.
youtu.be/fQZj85Db_Kc?t=1343
youtu.be/fQZj85Db_Kc?t=1343
AudiWorld Senior Member
Joined: Jan 2005
Posts: 769
Likes: 42
No, that error has nothing to do with the lambda sensor. "cold start valve" is the 5th injector in the intake manifold, used the E85 cold starting where the direct injectors do not flow enough for E85 cold ignition. I have no idea if it's common for that injector to fail resulting in a P303D, of it's more likely a wiring issue. But nothing to do with the O2 sensor.
youtu.be/fQZj85Db_Kc?t=1343
youtu.be/fQZj85Db_Kc?t=1343
AudiWorld Super User
Joined: Dec 2001
Posts: 13,997
Likes: 3,376
From: Georgia
Who can say what eventually was programmed, but the SSP on the CFKA / CPMA engines discusses the N17 cold start valve (injector) and is pretty clear it's only used when the HPFP alone cannot deliver the necessary fuel volume. SSP 439. So the HPFP is good on normal gas to -30°C. But it's not enough for E85 starting just under -10°C. It says the N17 is only used to supply beyond the HPFP's limit, so it only get invoked at -10°C and under, and only if there's some level of Exx determined.
"At sub-zero temperatures, a much greater quantity of E85 is required for starting compared to petrol. About twice the amount of E85 is needed to ensure that the engine starts reliably at –30 °C."
"At sub-zero temperatures, a much greater quantity of E85 is required for starting compared to petrol. About twice the amount of E85 is needed to ensure that the engine starts reliably at –30 °C."
AudiWorld Senior Member
Joined: Jan 2005
Posts: 769
Likes: 42
Who can say what eventually was programmed, but the SSP on the CFKA / CPMA engines discusses the N17 cold start valve (injector) and is pretty clear it's only used when the HPFP alone cannot deliver the necessary fuel volume. SSP 439. So the HPFP is good on normal gas to -30°C. But it's not enough for E85 starting just under -10°C. It says the N17 is only used to supply beyond the HPFP's limit, so it only get invoked at -10°C and under, and only if there's some level of Exx determined.
"At sub-zero temperatures, a much greater quantity of E85 is required for starting compared to petrol. About twice the amount of E85 is needed to ensure that the engine starts reliably at –30 °C."
"At sub-zero temperatures, a much greater quantity of E85 is required for starting compared to petrol. About twice the amount of E85 is needed to ensure that the engine starts reliably at –30 °C."
AudiWorld Super User
Joined: Dec 2001
Posts: 13,997
Likes: 3,376
From: Georgia
On the B8.5 era EA888 Gen3 (4-cyl) and EA837 evo (6-cyl), MPI (port injection) was reintroduced for certain emissions configurations (Euro6, etc). But this is real dual injector config, one direct and one port per cylinder. This was never used on US emissions engines. And it has no relation to the cold start injector for the E85 config. The EA888 Gen2 CFK (EU emissions) and CPM (US emissions) were the only formal flex fuel gas engines. All the rest of the EA888 and EA837/EA839 are, to my knowledge, gas only gas engines.
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