Hey guys! Been a while since I've posted on here. Good news is that my W210 beauty has been plugging along nicely for the last couple years. I've been taking the time to work on my (relatively) recently acquired R170 2001 SLK320 Sport 6-speed. Fun toy!
Never the less, was running dangerously low on fuel the other day on my way home from a meeting when my CEL illuminated. Ugh! Checked codes (hats off to Greg) and got code of P0150. So, "bank 2 front O2" issue. Hoping it was caused by gunk at the bottom of my tank (did I mention I was dangerously low on fuel), I filled up with premium as always, cleared the code, and went on about my business. It was good for 4 days, then the light returned. Dammit.
So is Bank 2 the passenger or Driver side? (In the US)
Might I be able to run some Seafoam through the intake and in the fuel to clean the sensor?
Just a little concerned as I have a lovely VA emissions test to complete by end of August ...
How many miles on the car Greg? If you are in the neighborhood of 100K or over than you are about due. They were on sale at Amazon last time I checked, OE style plug&play ones were about $79 a piece, if you want to splice the wires and work a little longer, they are about as low as $35 a piece. I'd replace both of the front ones at the same time.
If you're going to DIY and want to save money, go with the Bosch "universal." If you would rather save time, or you are going to have someone else do it, get the direct fit ones.
And I agree to just change both of the front ones together. Wait on the rear pair until they code.
Sweet! Ordered my sensors off eBay. Put in a good word on Greg's DYI thread. Really appreciate the quick and very helpful responses. Love this car, love this community!
Cheers -- Greg
2000 E320 Sedan
2001 SLK320 Sport 6-speed
Ebay...eek. I hope you get what you think you're getting. Even with an Amazon marketplace vendor I initially got defrauded (the thread is in the forum), though the leverage through Amazon got me a complete refund. Did you go with direct fit or universal?
You might want to be sure you have some PB Blaster around, or better, some Kroil. As the car is cooling each evening (not hot but still warm) for a couple of days before the work, spray a little bit at the base of the sensor where it threads into the pipe. That will help penetrate and should make it easier to get them out.
A quality O2 sensor socket is absolutely required (unless you're dropping the exhaust), but also of immense helpful are the "wobble" extensions, at least one of them. That will give you just enough variance off-center to work above the engine easily as pictured in the DIY.
All done. Only took about two hours to do both sides. Passenger side (bank 1) is easier if you pull the filter box top and MAS to give you a little more arm room. The driver side (bank 2) has a lot less room, but the sensor is easier to see.
I got an offset sensor socket that I think made the job a little easier too. I considered putting the car up on my RinoRamps and getting to the sensors from the bottom, but it was easy enough from the top with multiple extension.
Thanks again for the great advice and excellent write up.
good deal. yeah service life for oem sensors is approx. 100K as a rule of thumb (sometimes earlier)
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