165,000 Miles
After misfire P0303, replaced coil pack, spark plugs OK, Vehicle reported P0420.
No instance of the code before Misfire, verified by scanner.
Live data from scanner shows:
STFT: Bouncing between -6.0 to 3.0
LTFT: 6.0
o2 sensor 1: showing correctly
o2 sensor 2: cold - bouncing, at full temp (highway speeds) flat voltage between.5-.7 volts
Both Cat convertors changed less then a years ago with OEM.
Brand new o2 sensors replaced at the same time with OEM.
Full exhaust replaced at the time of Cat replacement.
Vehicle shows no power reduction, no acceleration issues, no starting issues.
Noticed recent poor fuel consumption.
Possible resolutions:
Leaking fuel injector(s), not overly noisy
Bad or fuel soaked EVA canister (no codes shown)
Bad #2 o2 sensor
Manifold Catalytic Converter
Ideas?
Thanks for your help
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Tuesday, November 19th, 2024 AT 9:26 AM