I have a 1995 C220 Merc Benz.
The check engine light came on and the DTC code is PO141.
On the internet PO141 indicates
O2 sensor heater circuit malfunction ( Bank 1 Sensor 2)
I am not very knowledgeable in cars. So I apologize for any questions
that appear basic.
1. What does "O2 sensor heater circuit malfunction" mean?
Does this mean that heater is broken ?
Does this mean that just the sensor needs to be replaced
or does it mean that other work needs to be done ?
2. What is the part number so that I can price it on the internet?
3. How much should a mechanic in the SF Bay Area,CA charge for
replacing this sensor ?
Oxygen sensor is used to monitor if the engine burns the fuel
efficiently and completely. There is one (sensor 1) before catalytic
converter and another one (sensor 2) after. On V engines (V6, V8,
etc.), the exhaust comes out from two sides so there is bank 1 and 2.
Your car has only one side (bank 1) and two sensors (1 and 2).
The O2 sensor operates in high temperature. Before it is hot enough,
the computer will use more fuel which wastes gas and produces more
pollutant. Therefore, a heater is built into the sensor so it can reach
high temp pretty fast. P0141 means that built-in heater is not working
Heated O2 sensor usually lasts about 100k miles. Yours is already ahead
of most. The front (#1) sensor may need replacement soon (if it has not
been replaced yet).
Solution: replace the sensor and reset the check engine light.
The sensor is about $70 to $100 each on the internet. Check
AutoHausAZ.com. It is close to you. Buy the exact fit, not the
universal one (cheaper but more labor). The removal/installation is
roughly an hour. If your car layout is similar to C280, the sensor 2 is
hidden on top of the exhaust pipe. It can be felt but not seen. Once I
found the location, it was an easy job (with right tools).
Tasleem Khanna wrote:
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