PeachParts Mercedes-Benz Forum - View Single Post - Check engine light help o2 sensor code!!!

sakpase · #10 01-18-2010, 12:15 PM

Quote:

Originally Posted by syljua

Well, I'll answer here instead of at benzworld, since you've explained better here...

Giving the P0132 is a token of that the voltage on the sensor is permanently
high. High voltage, indicates a rich running engine. Changing out the sensor
will not mend that. Its merely showing what its happening. That fits your horrible gas
milage also. And since you know what you did when this occurred, rewire the MAF, well
that would be prime suspect... The MAF might give slightly off reading, at least
not wildly wrong, that would give a rich condition, that is the O2 sensor task
to discover. Your O2 may now be so full of carbon, that the other condition P1131
turns up.

Read about sensor here;
http://www.gnttype.org/techarea/ecmsensors/O2sensors.html

Other things it could be, wrong timing, leaky fuel pressure regulator.

br,
syljua

Thanks for all those great info syljua. A benz tech once told me rewired the mass sensor could will give slightly off reading to the ecu, i tried to rewired it because it cost like $300 a benz tech said. I thought it was the cat and i put a magaflow cat my car have 173000 my cat look like it was clogged because i cant see thru the other end when i put a light, hopefully it wasn't a waste of money of putting a new cat. I think i'll start by checking for leaky fuel pressure regulator hopefully it's not wrong timing, and i guess i have to replace the mass airflow sensor harness since it didn't come with the engine wiring harness. Someone said in the post that it could be the temp sensor, but i don't need no where in the article they mention temp sensor. Thanks to all of you again guys.