I have a check engine light. I get OBDII codes PO304, PO305. PO306 and
P0300. Which is misfire on Cyls 4, 5, and 6. I reason that is a bad
O2 sensor or both O2 sensors on one bank. Are 4, 5, and 6 on one
bank?? Which bank are 4, 5, and 6 on? I coundn't find a cyl layout.
There are 4 O2 sensors so how do I find the bad one or two? Bosch
universal O2 sensors are $80 each so I don't want to change all four to
find the one bad one. Thanks Bob
Not sure why you would think this is a bad O2 sensor. Does the car misfire
as when the engine is first started (cold)? If so, then it's not an O2
sensor as they don't activate until they warm up (takes a couple of
O2 sensor malfunction would set the specific trouble codes. The range of 02
sensor trouble codes is P0150 - P0167. You are not getting any of those are
I believe you have other issues to chase down . I would start with the
Thanks for all of the inputs. My codes were all in the P0304 thru 6
range. I live in the SF Bay area. The car has only 17,000 mi. It's
hard to believe that ignition parts wear out that quickley. Maybe it
is the 5 years and not the mileage. I am due for my yearly service so
I guess I'll let them handle it. I am up for bolting on a new sensor
but tearing into the ignition system is a bit much.
California has its own warranty specs. Calif covers things that the 8/80 does
not. For smog
purposes, Calif is in its own world. Before MB built all the cars to meet Calif
specs, they built 2
separate spec cars: Fed version had 491 in the option field, Cal had 494. All
are now 494.
A prime example are the 1985 300D-T and 300SD. 49 state cars used the 1984 617
engine and the 722.3
transmission. Cal cars used a 617 with a redesigned intake with a trap oxidizer
on it. The air
filter was no longer on top, it is in the pass front corner. The transmission is
the small 722.4.
There is a fine line between reality and fantasy.....
Reality is, Calif has it's own emission coverage and it is NOT 8/80.
Using a model year 2001 gasoline engine as an example:
Not counting the 4 yr/50K MB warranty, there are 4 different emission warranties.
Federal coverage: 2 yr/24K and 8 yr/80K
Calif, Maine, Mass, and Vermont: 3 yr/ 50K and 7 yr/70K
If you own a MB, look in your packet for the emissions booklet. It explains all
emission warranties. Towards the back will be charts of what is covered by what
As an example, the intake manifold is ONLY covered by 7/70, NOT 8/80. The engine
control module is
covered by 7/70 and 8/80, The malfunction indicator light is covered by 8/80 but
I can take any vin number and submit to MB warranty with a damage code and
instantly know if the
part is covered or not. I used a 2001 E320 that does not have ELW or Starmark or
CPO so the results
are not biased.
I used 7/70 damage codes and 8/80 damage codes and used 2 different mileage
figures, 68999 and
78999. The electric accellerator damage code is 14031737. Under the emission
coverage guidelines, it
is a 7/70 part ONLY. Using the above car at 68999, it is 100% covered. Using
78999 miles it is NOT
If anyone wants a dose of reality, I can fax you the printouts showing emission
coverage in the real
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