Are Jeep Freelander's front oxygen sensor and rear oxygen sensor universal?

Not universal. Jeep Freeman's front oxygen sensor is generally installed before three-way catalysis, and the rear oxygen sensor is generally installed after three-way catalysis. Before the three-way catalysis, the oxygen concentration in the exhaust gas fluctuates in a large range, which requires the front oxygen sensor to sense the oxygen concentration that fluctuates in a large range. However, the oxygen concentration in the exhaust gas after the three-way catalytic reaction has been adjusted to a small fluctuation range, so the post-oxygen sensor only needs to sense in a small concentration range.