Hi,

 

I have a Mercedes ML 320, 2000.

 

I just replaced all four oxygen sensors but the "Check Engine" has returned right after the replacement. 

 

The codes that have been indicated: 157, 161, 135, 155, 141 and 134.

 

Do you know why those codes would appear even with all brand new Bosch oxygen sensors? 

 

I am so puzzled...

 

Thanks,

 

Emily

Comments

Profile picture for user Pen teller

I am not sure what it can be but let me list the meanings of each of these and it might give you some clue on what is wrong here:

 

1. P0157 = O2 Sensor Circuit Low Voltage (Bank 2, Sensor 2)

2. P0161 = O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2) – Downstream

3. P0135 = Heated Oxygen Sensor Heater Circuit Malfunction (Bank1 Sensor1)

4. P0155 = 02 Sensor Heater Circuit Malfunction (Bank 2, Sensor 1

5. P0141 = O2 Sensor Heater Circuit Malfunction

6. P0134 = O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)

Profile picture for user Markthemechanic

From the information you provided and the meanings of these fault codes, it is pretty much clear that there is a presistent problem with your O2 Sensor heater and there is a malfunction in the circuit. Both in Bank 1 and Bank 2, as well as a problem in both sensors.

 

Since you have replaced the sensors, it means the problem is actually the heart circuit  in Bank 1 and Bank 2. Please check those.

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