@T5-T6-Schnappi said in S60 - catalytic converter low efficiency.:

@Leinth the absolute fuel pressure should be around 480+-5 kPa or 380+-5 kPa relative pressure at idle RPM, transmission in neutral and warm engine, and the duty cycle of the fuel pump should be around 50%+-10%.

I do not have VIDA or vdash to check for this, the one i have only shows "fuel pressure" which was ~386 at idle and it had nothing on duty cycles for fuel pump. There is a plan to service the car this month so I will ask them to remove the spacer. Will see if P0420 returns and the lean code(forgot the number again) disappears.

@T5-T6-Schnappi said in S60 - catalytic converter low efficiency.:

@Leinth Did you buy the car with this problem, or did it appear some time after you bought it?

The P0420 code appeared like 3-4 years into the ownership of the car. Most of the issues you have mentioned I have already checked. Haven't checked the piston rings, but as they is no oil consumption there shouldn't be a problem.

Lean code appeared the same or next day I installed the spacer for o2 sensor. The spacer is probably too large/long as the o2 sensors show literary nothing now. You have to high-rev the engine for like 1-2 mins o2 sensor to even start showing something, then it shows a steady graph like it should.

There is no "puzzle" to be solved. I had a decent mechanic look at the car, and his conclusion was that cat started dying.

If it was easy to get to the upper o2 sensor I would have "washed" the cat before adding the spacer.

@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.

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.