Oxygen sensor voltage and short-term fuel correction

1. Switch the two sensors after the engine is warmed up (or after driving on the road). If the rear sensor still has no operating voltage, please replace it. On the contrary, the circuit or ECU itself is faulty.

2. Replacing only one oxygen sensor can improve the situation, but it is impossible to completely solve the problem of nearly doubling the fuel consumption. Check whether the grounding wire of engine harness is loose and whether the grounding point of ECU is in good contact. After replacing the test with a new ECU, the effect will be obvious. Sometimes the computer socket is poorly contacted and hidden. Please check it in detail.

If replacing the computer can't solve the problem, it's a mechanical failure of the engine block-please check the cylinder pressure, which is disappointing. Because I just drove less than 30 thousand kilometers, I hope this is not the result.