Having problems with your 1996 BMW 7 Series ?
Code: Insufficient Catalytic Converter 1? I replaced the catalytic converters on my car at a local muffler shop and afterwards the SES light came back on. The code says insufficient catalytic converter 1. I then replace the O2 sensors after the converters because this is what the shop recommended but again the SES light is on reading the same code. Do you have an idea of what I need to do?
You should have changed the front o/2 sensors if any. The rears just read what the cats are doing and the fronts control the fuel feeds to the engine. Using Aftermarket cats is usually a hit or miss prop on the p0420. U need to find a shop that can really diag this for you because it sounds like only one bank is coding for you therefore bank 2 is ok. Go to IATN.com and find a good mechanic.
Repair Help & Product Troubleshooting for 1996 BMW 7 Series
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