code P0430
#21
Are you high? WTF is that supposed to mean. If you didn't need to be taught how the system works, you wouldn't question my statement about the impossibility of a catalyst monitor setting a catalyst inefficiency DTC. Clearly, you don't grasp how the system works.
#24
[QUOTE=Marc 85Z28;15560237]1. It is IMPOSSIBLE for an O2 sensor (catalyst monitor in this case) to set a catalyst inefficiency DTC.
A slow upstream O2 will, normally will have some BXS1 codes along with it, but not always.
OP- I would suggest scanning and looking at upstream O2 activity, if its only flagging B2, see how B1 and B2 compare. They should be very active.
A slow upstream O2 will, normally will have some BXS1 codes along with it, but not always.
OP- I would suggest scanning and looking at upstream O2 activity, if its only flagging B2, see how B1 and B2 compare. They should be very active.
Last edited by rnl35thss; 12-23-2011 at 09:03 PM.
#25
Would a fuel treatment help To remove carbon build up ? Could that set that code off ? I will be taking my car to a tuner , hopefully he can give a better code reader .
#27
Joined: Nov 2001
Posts: 32,381
Likes: 1,809
From: Schiller Park, IL Member: #317
It's great if you can get this fixed for free (by the dealer, for those still under warranty), but I wouldn't spend a bunch of money to chase down the problem since it's just an emissions code and can be deleted/ignored (again, assuming the front O2s are working properly).
#28
No, it won't. If the PCM detects slow repsonse on one of the sensors as compared to another, it would set a DTC. Furthermore, a PCM WILL NOT set a catalyst inefficiency DTC if it detects slow repsonse on either of the 2 sensors. Slow response CANNOT trigger a catalyst inefficiency DTC. See my post above about researching how this system operates.
#29
#30
#31
CIRCUIT DESCRIPTION
In order to maintain reasonably low emissions of hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx), the engine controls system uses a 3-way catalytic convener. The catalyst within the converter promotes a chemical reaction which oxidizes the HC and CO in the exhaust gas. This reaction converts these chemicals into harmless water vapor and carbon dioxide. The catalyst also reduces NOx, converting the NOx to nitrogen. The powertrain control module (PCM) monitors this process using Bank 1 HO2S # 2. Bank 1 HO2S # 2, located in the exhaust stream past the 3-way catalytic converter, produces an output signal which indicates the oxygen storage capacity of the catalyst. This determines the catalyst's ability to effectively convert the exhaust emissions. If the catalyst is functioning correctly, the Bank 1 HO2S # 2 signal will be far less active than the signal produced by Bank 1 HO2S # 1. This indicates that the 3-way catalytic converters oxygen storage capacity is below an acceptable threshold.
When the Conditions for Running this DTC are met, the following conditions occur:
The PCM captures the current rear HO2S rich-to-lean status.
The Air/Fuel ratio transitions from rich to lean, or from lean to rich, depending on the capture rear HO2S rich-to-lean status.
The Air/Fuel ratio transitions a second time opposite the first Air/Fuel ratio transition.
The PCM captures the response time of the front and rear heated oxygen sensors when the Air/Fuel ratio transitions occurred. The response time is the time during which the HO2S goes from below 300 mV to above 600 mV , and from 600 mV to below 300 mV .
The PCM measures the time for the rear HO2S voltage to cross a reference rich-to-lean threshold, minus the time for the front HO2S voltage to cross the same rich-to-lean threshold. The time difference from the front and rear HO2S is the oxygen storage capacity of the catalyst. This DTC sets if the time exceeds a predetermined threshold.
^Above is from service info. Marc- I am by no means saying that the best way to take care of a P0430 is to slap upstream O2s on it. What I am saying is that it can. I've seen it before. I would also be asking the dealer why they didn't fix it. If we disagree then I can agree to disagree. OP- tune away!
In order to maintain reasonably low emissions of hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx), the engine controls system uses a 3-way catalytic convener. The catalyst within the converter promotes a chemical reaction which oxidizes the HC and CO in the exhaust gas. This reaction converts these chemicals into harmless water vapor and carbon dioxide. The catalyst also reduces NOx, converting the NOx to nitrogen. The powertrain control module (PCM) monitors this process using Bank 1 HO2S # 2. Bank 1 HO2S # 2, located in the exhaust stream past the 3-way catalytic converter, produces an output signal which indicates the oxygen storage capacity of the catalyst. This determines the catalyst's ability to effectively convert the exhaust emissions. If the catalyst is functioning correctly, the Bank 1 HO2S # 2 signal will be far less active than the signal produced by Bank 1 HO2S # 1. This indicates that the 3-way catalytic converters oxygen storage capacity is below an acceptable threshold.
When the Conditions for Running this DTC are met, the following conditions occur:
The PCM captures the current rear HO2S rich-to-lean status.
The Air/Fuel ratio transitions from rich to lean, or from lean to rich, depending on the capture rear HO2S rich-to-lean status.
The Air/Fuel ratio transitions a second time opposite the first Air/Fuel ratio transition.
The PCM captures the response time of the front and rear heated oxygen sensors when the Air/Fuel ratio transitions occurred. The response time is the time during which the HO2S goes from below 300 mV to above 600 mV , and from 600 mV to below 300 mV .
The PCM measures the time for the rear HO2S voltage to cross a reference rich-to-lean threshold, minus the time for the front HO2S voltage to cross the same rich-to-lean threshold. The time difference from the front and rear HO2S is the oxygen storage capacity of the catalyst. This DTC sets if the time exceeds a predetermined threshold.
^Above is from service info. Marc- I am by no means saying that the best way to take care of a P0430 is to slap upstream O2s on it. What I am saying is that it can. I've seen it before. I would also be asking the dealer why they didn't fix it. If we disagree then I can agree to disagree. OP- tune away!
Last edited by rnl35thss; 12-24-2011 at 05:32 PM.
#32
Joined: Nov 2001
Posts: 32,381
Likes: 1,809
From: Schiller Park, IL Member: #317
That's the best bet, IMO. Cat inefficiency is only a problem if you need to pass a sniffer test, and tuning/O2 sims can take care of any scan tests that you might need to pass.
#33
The PCM captures the current rear HO2S rich-to-lean status.
The Air/Fuel ratio transitions from rich to lean, or from lean to rich, depending on the capture rear HO2S rich-to-lean status.
The Air/Fuel ratio transitions a second time opposite the first Air/Fuel ratio transition.
The PCM captures the response time of the front and rear heated oxygen sensors when the Air/Fuel ratio transitions occurred. The response time is the time during which the HO2S goes from below 300 mV to above 600 mV , and from 600 mV to below 300 mV .
The PCM measures the time for the rear HO2S voltage to cross a reference rich-to-lean threshold, minus the time for the front HO2S voltage to cross the same rich-to-lean threshold. The time difference from the front and rear HO2S is the oxygen storage capacity of the catalyst. This DTC sets if the time exceeds a predetermined threshold.
The Air/Fuel ratio transitions from rich to lean, or from lean to rich, depending on the capture rear HO2S rich-to-lean status.
The Air/Fuel ratio transitions a second time opposite the first Air/Fuel ratio transition.
The PCM captures the response time of the front and rear heated oxygen sensors when the Air/Fuel ratio transitions occurred. The response time is the time during which the HO2S goes from below 300 mV to above 600 mV , and from 600 mV to below 300 mV .
The PCM measures the time for the rear HO2S voltage to cross a reference rich-to-lean threshold, minus the time for the front HO2S voltage to cross the same rich-to-lean threshold. The time difference from the front and rear HO2S is the oxygen storage capacity of the catalyst. This DTC sets if the time exceeds a predetermined threshold.