I have a Lexus rx300 with 190k miles. After driving longer than around 10-15 miles the VSC and ABS light come on, it started from a brake fluid leak at a fitting for the ABS module, tightened it and hasn't gone down since, however now the lights pop up ever drive. I'm thinking a wheel speed sensor going out, but any advice is appreciated. Then a CEL came on for bank 1 sensor 1 emissions efficiency low I believe. I know the flex pipe has an exhaust leak and was wondering if this could be setting the code and possibly cause the idle to fluctuate occasionally or make the gas mileage drop? Thank you for your time and knowledge.
Yes the emissions efficiency will be off with a leak. The O2 sensors are sending back incorrect data. If you have a decent scan tool you can see which wheel sensor is having an issue using codes, if there isn’t any codes you’ll need a scanner that shows live data see which wheel it is. If it isn’t a wheel sensor it’s possible you could have an air bubble in the ABS module itself. You’ll need a scantool with service functionality to bleed the ABS system correctly.
