Why do I have all these codes

Asked by Sep 12, 2019 at 06:46 PM about the 1999 Lexus ES 300 FWD

Question type: Maintenance & Repair

8 codes. 2 old ( both knock sensors, both have
been replaced along with the wiring harness).
Yesterday car started to smell faintly of gas
fumes. Today car was running fine , then at
stoplight it started to idle rough and stumble. And
6 new codes along with it. P0120, P0441 (shows
this code twice), P0300, P0304 and P0305

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