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I tried Rislone Cat Cleaner, STP 1 Tank Tuneup and Lucas Fuel System Cleaner and removed the code with my scan tool but the code came back right away after driving 50km.
The car sounds way better and is performing very well compared to before.
Broken oxygen sensor or the cat done?
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
You can always try something like this to try to identify which part is faulty. Use it with your post-cat sensor. If the CEL goes away, it may be your cat. Or, you could replace the O2 sensor and see if that works.
I tried Rislone Cat Cleaner, STP 1 Tank Tuneup and Lucas Fuel System Cleaner and removed the code with my scan tool but the code came back right away after driving 50km.
The car sounds way better and is performing very well compared to before.
Broken oxygen sensor or the cat done?
if the code says low catalytic converter efficiency or along that line 95% of the time it’s a bad catalytic converter. You’ll need a new one. It’s not the O2 sensor.
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Originally Posted by Just204
if the code says low catalytic converter efficiency or along that line 95% of the time it’s a bad catalytic converter. You’ll need a new one. It’s not the O2 sensor.
So, how does the ecu determine the cat has low efficiency?
I replaced o2 sensors for my cat and it made zero difference. Replaced my cat with one from this company and it showed up in less than a week. Check engine light gone.
[QUOTE=RobertR728;8964143]I replaced o2 sensors for my cat and it made zero difference. Replaced my cat with one from this company and it showed up in less than a week. Check engine light gone.
After running a few more additives including another Rislone Cat Cleaner the code is still throwing p0420 bank 1 and bank 2 sensor reading too lean because of cat converter. Going to replace the cat shortly.
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