One problem related to o2 sensor has been reported for the 2004 Honda CR-V. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Honda CR-V based on all problems reported for the 2004 CR-V.
Problem: sudden acceleration due to defective throttle body. The idle rpms are excessive upon startup and lead to sudden acceleration during braking to a stop. Background: malfunction lamp light was constantly turning on and off. Took the car to a Honda dealership and they only found the error code for the O2 sensor. Later took it to a local mechanic to fix the O2 sensor and they found a defective throttle body (error code p0122). There are several forums which address this exact issue on 2002-2004 Honda crv.