S60 - catalytic converter low efficiency.
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Hello,
I just got an error code for low efficiency of catalytic converter. 1/4-1/3 of the cars price. So I was looking if it's possible to disable this check of lower the threshold so I do not get this error message? The error code appears and cleans itself intermittently. The car is a Petrol T6, so no aftermarket catalytic converters I could find exist.
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@Leinth Can you please post a list with all DTCs in the car? How many kilometers do you have on the clock, and does your engine consume oil? If yes, how much? The 3 liter T6 is known for high oil consumption due to low quality pistons and piston rings, which destroys/melts the cat over time. Also loose/broken studs at the exhaust manifold are really common, as well as cracked turbo/exhaust manifolds. Is the car tuned or stock?
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@T5-T6-Schnappi thanks for the reply. No oil consumption at all. The car is from USA. The car is stock. The car is at ~180k kilometers.
I had the cat inspected by a probe and it's not melted/damaged. I was getting and error P0420 and no others If I remember it correctly. I had o2 sensor check and it was working fine, it graph from it wasn't steady. So we added a spacer on the o2 sensor. It "solved" the P0420 error, but now I'm sometimes getting another error related to the o2 sensor. That it's stuck on lean.
The error code wasn't constant, it sometimes appeared when I did longer trips with harder acceleration on the highway. Same as the stuck lean error.
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Lean codes mean there's more O2 in the exhaust gases than the MAF metered. This can be caused by a dirty MAF, vacuum leaks, exhaust leaks, PCV leak, too low fuel pressure, and so on....
So, you should first clean the MAF with special MAF cleaner and don't use "sport" air filters.
Could you also please post the exact temporary and permant codes you have seen since you have that problem? Solving a puzzle without all parts is impossible.
Lean code after hard driving sounds like an exhaust leak, so check the connection between cylinder head and turbo manifold. Burnt gaskets and loose/missing bolts on the manifold are really common on T6s that get frequently floored.
Also check the PCV/oil trap and the small hose from the PCV towards the intake pipe. If your car "whistles" after cold start, replace the PCV.
Also check the duty cycle of the fuel pump and fuel pressure while driving.
What fuel are you using? Anything below 98 octane is a no-go if you floor it on a regular basis.
