I have a 2000 Mercdes E320 that has the check engine light on. I took it to the garage and when they put the tester on it showed that the two left ox sensors need to be replaced, This was done but with a few days the light came back on. The garage checked again and this time it was the right side sensor needed to be replaced this was doen and now the light has come back on again showing the two rear sensors needing replacement but they are brand new. Is it possible that the sensors are defective or could there be something else that is the problem.
Well if the sensors are defective the garage should warranty them,unless they are aftermarket products
then the warranty isn't so great.
If the shop that did the work determines that the sensors are a-ok then there may be a problem with the ECU or the circuit.
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