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Those codes are for both front oxygen sensors lean. This may be due to two lazy sensors but I would check for a vacuum leak or exhaust leak before the sensors. Look at the PCV tube to see if it's leaking. Also what you can do is spray some carb cleaner around the intake and vacuum lines listening and feeling for a change in engine rpm. If you feel a change then you found a leak. Also if the scan tool used to read the codes can read pids or live data see if you can monitor the oxygen sensors and long/short term fuel trims as this will show us how the engine is running and what the PCM is seeing/commanding.