2000 W210 Check Engine Light - P0170 P0173
01-05-2014, 11:21 PM
#1
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2000 E320 Wagon
2000 W210 Check Engine Light - P0170 P0173
Greetings all. I know this is a common problem but my check engine light remains on. I initially checked the codes with my scanner and obtained P0170 and P0173. I replaced the MAF and cleared the codes but the check engine light
continues to come on and stay on and I continue to get the P0170 and P0173 codes. This is a 2000 E320 wagon with 137,000 miles.
The car runs well but I don't think my mpg is as good as it used to be.
The gas cap is original and appears to seal well.
Can anyone provide a list of possible causes so that I can troubleshoot?
Thanks everyone.
continues to come on and stay on and I continue to get the P0170 and P0173 codes. This is a 2000 E320 wagon with 137,000 miles.
The car runs well but I don't think my mpg is as good as it used to be.
The gas cap is original and appears to seal well.
Can anyone provide a list of possible causes so that I can troubleshoot?
Thanks everyone.
01-07-2014, 09:26 AM
#2
Out Of Control!!
Here we go again wasting time and money on MAF's when P0170 and P0173 have nothing to do with a MAF issue on your engine repeat on your engine.
The other bad news is that people with much less experience reading what you did surcome to what I call the BS syndrome and start changing out MAF's because they read on this forum or Bozobenz that "It's gota be the MAF" wada shame!!
The 0170(right bank) and 0173(left bank) fault refers to the ECU inability to self adapt the mixture to maintain a lambda of 1, it as gone to the design limit and still can't self adapt.----a very noticeable result is that your gas mileage drops-----exactly what you are experiencing!!
The sad news is that with out the proper test equipment you can't run the prescribed four point test to determine if the issue is with the ECU, injector, leaks, bad valves and or O2 sensors.
You need to seek professional help-----
The other bad news is that people with much less experience reading what you did surcome to what I call the BS syndrome and start changing out MAF's because they read on this forum or Bozobenz that "It's gota be the MAF" wada shame!!
The 0170(right bank) and 0173(left bank) fault refers to the ECU inability to self adapt the mixture to maintain a lambda of 1, it as gone to the design limit and still can't self adapt.----a very noticeable result is that your gas mileage drops-----exactly what you are experiencing!!
The sad news is that with out the proper test equipment you can't run the prescribed four point test to determine if the issue is with the ECU, injector, leaks, bad valves and or O2 sensors.
You need to seek professional help-----
01-10-2014, 02:29 PM
#5
Out Of Control!!
A man just has to understand his limitations and if you do not have a copy of DAS Xentry and access to MB WIS and some special tools you have just reached you limitations.
I gave you the four areas that are normally tested to solve the mixture issue!!
If you think that every electronic problem on an MB is a DIY's without the proper tools you sir are sadly mistaken!
I gave you the four areas that are normally tested to solve the mixture issue!!
If you think that every electronic problem on an MB is a DIY's without the proper tools you sir are sadly mistaken!
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01-10-2014, 03:42 PM
#8
MBWorld Fanatic!
@impalaman
How old are the oxygen sensors? I can direct you to a page that will tell you how to test them. However, if they’re the original 15 year old sensors, you may want to save yourself some trouble and just replace them.
If you want the technical reason why, it’s because oxygen sensors are normal wear parts and have a limited lifespan. They typically will produce low voltage numbers when dying. The ECU reads low voltage as a signal that the engine is running lean. To correct that, the ECU will enrich the mixture until the O2 sensor sends a signal above 0.6 volts. If the ECU doesn’t receive the expected signal (and it may not from dying O2 sensors) and the mixture has been enriched beyond what would be considered normal, the check engine light will illuminate. BTW, in those circumstances the engine is running very rich, it’s just that the ECU doesn’t know it. So rich that the car owner typically notices the poor fuel economy. That’s a bad position to be in. Why? First, that enriched mixture is hard on the rings as the thin layer of oil on the cylinder walls gets washed down with gas. Pull your oil dipstick. Does it smell like gasoline? If so, that’s another really bad position to be in. By the time you can smell the difference, the oil has been thinned out substantially. Gasoline logged oil doesn’t lubricate very well. Along with wearing the cams, that’s hard on rod and main bearings. Also, overly rich mixtures kill catalytic converters.
In fact, if you have the original oxygen sensors, you may want to use this as an opportunity to review all the maintenance items that may have been overlooked throughout the years.
I hope that helps
How old are the oxygen sensors? I can direct you to a page that will tell you how to test them. However, if they’re the original 15 year old sensors, you may want to save yourself some trouble and just replace them.
If you want the technical reason why, it’s because oxygen sensors are normal wear parts and have a limited lifespan. They typically will produce low voltage numbers when dying. The ECU reads low voltage as a signal that the engine is running lean. To correct that, the ECU will enrich the mixture until the O2 sensor sends a signal above 0.6 volts. If the ECU doesn’t receive the expected signal (and it may not from dying O2 sensors) and the mixture has been enriched beyond what would be considered normal, the check engine light will illuminate. BTW, in those circumstances the engine is running very rich, it’s just that the ECU doesn’t know it. So rich that the car owner typically notices the poor fuel economy. That’s a bad position to be in. Why? First, that enriched mixture is hard on the rings as the thin layer of oil on the cylinder walls gets washed down with gas. Pull your oil dipstick. Does it smell like gasoline? If so, that’s another really bad position to be in. By the time you can smell the difference, the oil has been thinned out substantially. Gasoline logged oil doesn’t lubricate very well. Along with wearing the cams, that’s hard on rod and main bearings. Also, overly rich mixtures kill catalytic converters.
In fact, if you have the original oxygen sensors, you may want to use this as an opportunity to review all the maintenance items that may have been overlooked throughout the years.
I hope that helps
01-10-2014, 03:58 PM
#9
Out Of Control!!
Alternatively I can put together a Dell 630 laptop with an installed copy of DAS Xentry for 525 USD---50% with order---the PART D mux and cables can again be acquired by searching the internet for the hundreds of resellers providing that type of product. Typically 425USD
With my laptop---there is no service---there is no schooling on how to use DAS Xentry and there is no technical support!! I guarantee that when you double click on the Xentry icon it will start the diagnostic process a splash screen will open and then you select the type of car------that's it, because I would have tested the system on a car before shipment.
01-10-2014, 08:12 PM
#10
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2000 E320 Wagon
@impalaman
How old are the oxygen sensors? I can direct you to a page that will tell you how to test them. However, if they’re the original 15 year old sensors, you may want to save yourself some trouble and just replace them.
If you want the technical reason why, it’s because oxygen sensors are normal wear parts and have a limited lifespan. They typically will produce low voltage numbers when dying. The ECU reads low voltage as a signal that the engine is running lean. To correct that, the ECU will enrich the mixture until the O2 sensor sends a signal above 0.6 volts. If the ECU doesn’t receive the expected signal (and it may not from dying O2 sensors) and the mixture has been enriched beyond what would be considered normal, the check engine light will illuminate. BTW, in those circumstances the engine is running very rich, it’s just that the ECU doesn’t know it. So rich that the car owner typically notices the poor fuel economy. That’s a bad position to be in. Why? First, that enriched mixture is hard on the rings as the thin layer of oil on the cylinder walls gets washed down with gas. Pull your oil dipstick. Does it smell like gasoline? If so, that’s another really bad position to be in. By the time you can smell the difference, the oil has been thinned out substantially. Gasoline logged oil doesn’t lubricate very well. Along with wearing the cams, that’s hard on rod and main bearings. Also, overly rich mixtures kill catalytic converters.
In fact, if you have the original oxygen sensors, you may want to use this as an opportunity to review all the maintenance items that may have been overlooked throughout the years.
I hope that helps
How old are the oxygen sensors? I can direct you to a page that will tell you how to test them. However, if they’re the original 15 year old sensors, you may want to save yourself some trouble and just replace them.
If you want the technical reason why, it’s because oxygen sensors are normal wear parts and have a limited lifespan. They typically will produce low voltage numbers when dying. The ECU reads low voltage as a signal that the engine is running lean. To correct that, the ECU will enrich the mixture until the O2 sensor sends a signal above 0.6 volts. If the ECU doesn’t receive the expected signal (and it may not from dying O2 sensors) and the mixture has been enriched beyond what would be considered normal, the check engine light will illuminate. BTW, in those circumstances the engine is running very rich, it’s just that the ECU doesn’t know it. So rich that the car owner typically notices the poor fuel economy. That’s a bad position to be in. Why? First, that enriched mixture is hard on the rings as the thin layer of oil on the cylinder walls gets washed down with gas. Pull your oil dipstick. Does it smell like gasoline? If so, that’s another really bad position to be in. By the time you can smell the difference, the oil has been thinned out substantially. Gasoline logged oil doesn’t lubricate very well. Along with wearing the cams, that’s hard on rod and main bearings. Also, overly rich mixtures kill catalytic converters.
In fact, if you have the original oxygen sensors, you may want to use this as an opportunity to review all the maintenance items that may have been overlooked throughout the years.
I hope that helps
I bought the car in summer of 2012 and obtained the maintenance records from the benz workshop that maintained the car. They replaced the "left rear" O2 sensor because of a P0161 code at the 106,000 mile mark. I'm familiar with OBDII systems..... just a newbie when it comes to MB. This is my first one.
I was about to just replace all of the O2 sensors for the hell of it. I think I may do that.
The car runs like a freight train. No hesitations. Oil looks good. It will do 100mph at the drop of a hat and keep on going. It also idles like a sowing machine.
My mpg is down just a tad bit however. Instead of 26 mpg on the hwy, I'm getting 24 now.
01-11-2014, 08:08 PM
#13
MBWorld Fanatic!
There are 4. Two before the primary cats and two downstream after the cats. The sole purpose of the secondary oxygen sensors is to determine whether the primary cats are working properly. I've replaced all four of my oxygen sensors and if I had to do it over again, I'd skip the secondaries until the CE light illuminates.
