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MJK1
Newbie


Joined: 03 Nov 2018
Posts: 11
Location: Church Broughton, Derbyshire


PostPosted: Thu Aug 15, 2019 5:17 pm    Post subject: Persistent 997.1 C2S engine fault codes Reply with quote

I have the following 3 engine fault codes keep coming back every couple of hundred miles. I’ve replaced the upstream bank 2 oxygen sensor but it’s not stopped the P0153 code. Anyone any idea what the problem could be?
 



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alpinaman
Montreal


Joined: 21 Feb 2012
Posts: 557



PostPosted: Thu Aug 15, 2019 5:53 pm    Post subject: Reply with quote

AOS letting unmetered air into inlet manifold ?
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6963
Location: Brighton


PostPosted: Thu Aug 15, 2019 6:02 pm    Post subject: Reply with quote

As long as there are no other fault codes listed .. ie tank vent then you have a leak in the exhaust ..

air is being drawn in and its registering a lean mixture on this sensor .

Check for blows close to this sensor .. perhaps a hairline crack .

Secondary air is an air pump that blows air into the exhaust from cold for 30 seconds to fast warm the cats .. its not working !
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MJK1
Newbie


Joined: 03 Nov 2018
Posts: 11
Location: Church Broughton, Derbyshire


PostPosted: Thu Aug 15, 2019 10:16 pm    Post subject: Reply with quote

That’s great thanks, I know of a slight exhaust leak but it’s at the joint between the catalyst and muffler on bank 1. I’ll have a look for others at the weekend and get them fixed.

If there are more than one unconnected problems, do they trigger fault codes at the same time? All these 3 codes always appear at the same time which I thought would mean they are connected.
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6963
Location: Brighton


PostPosted: Fri Aug 16, 2019 6:20 pm    Post subject: Reply with quote

Fault code details in the image below ..

You can see the 2 items it lists for this fault .. you have replaced the sensor so logically we are left with just an exhaust leak .

However .. that's not to say its not something else .. it's just so unusual that it was never listed on the fault code details .

Secondary air is not working at all as it lists a fault for both banks and not just the one with the lambda sensor fault .. this to me indicates 2 seperate faults .


The car tests the secondary air system by running it when the engine is at operating temp for a few seconds .. it looks at both bank lambdas for a lean mixture .. it then knows its working ok .. if it doesn't see this on both banks if flags a code .. which is what you have .

Logically its seeing something different on the single bank lambda sensor when driving hence the code is just for this bank , if linked then it should be both banks lambda sensor codes .

At work there's many different values from sensors i would be looking at .. here and i just have the fault codes so go by what they " suggest ".

Nothing to say the info is correct .. nothing to say they are not linked though ..

Basically .. if in doubt then fix the secondary air fault first then see if the lambda one comes back .


EDIT ..

On a single cycle from cold to hot then it would monitor and check both faults listed so yes it would flag both on a single journey .
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MJK1
Newbie


Joined: 03 Nov 2018
Posts: 11
Location: Church Broughton, Derbyshire


PostPosted: Fri Aug 16, 2019 9:41 pm    Post subject: Reply with quote

Thanks deMort that’s a great help. I’ve got a Durametric Diagnostic Software so I’ll see if I can get the Secondary Air Pump to work via the software. If it doesn’t, I’ll check it’s getting an electrical supply. If it is I guess it’ll be the pump. If the pump works I’ll check the valves and pipes of the secondary air system.

I’ll also have a good look at the exhaust and seal any leaks if there are any.
 
  
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