This weekly Q&A session answers your questions about cars and trucks. This week explores a 2000 Chevy Tahoe with a P0161 DTC and a 1998 Cadillac Catera with brake lights that won't turn off.

Question: 2000 Chevy Tahoe Limited

Hi Vincent!! How are you doing? I have a 2000 Chevy Tahoe Limited, it's the 1999 body-style and has the Vortec 5.7 liter V-8 it's a 2WD with A/C. I've recently had a "Service Engine Soon" light pop on at 172,000 miles. I hooked up a code reader to it and it told me the error was "P0161 B" O2 sensor heater bank and also told me it was 02 sensor 1 bank 2. I just wanted to know if this is correct and which side that sensor would be on. I know I have 4 sensors total; one before each cat and then one after each one. The dealer changed the sensors at 100,000 miles but I'd really like to save some cash this time.

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