p0056 code/headers/help me understand
#1
Super Member
Thread Starter
p0056 code/headers/help me understand
First off, I'm running amercian racing headers/catless x pipe and I got a p0056 code today. I remember reading that it's common to fry 02 sensors when you do headers, but I believe that was the upstream sensors, (17016) correct? Based on that previous research I did two new 17016 sensors right away when I got my car back from getting headers installed and before throwing it on the dyno.
However, the p0056 that is downstream sensor drivers side which would be part number "bosch 16749" i think? Which is NOT one of the sensors that people have issues with after doing headers? Should I replace these downstream sensors in pairs? And was I wrong to have thought that the EC V7 tune would have shut these off since I have no cats?
And finally, the plugs for the upstream and downstream are opposite judging by pics, one is male(07016) and one is female(16749), so there is no way that the guy that installed my 17016 back then could have put them in the wrong spot (I just remember him saying they were easy to get to at the time)?
However, the p0056 that is downstream sensor drivers side which would be part number "bosch 16749" i think? Which is NOT one of the sensors that people have issues with after doing headers? Should I replace these downstream sensors in pairs? And was I wrong to have thought that the EC V7 tune would have shut these off since I have no cats?
And finally, the plugs for the upstream and downstream are opposite judging by pics, one is male(07016) and one is female(16749), so there is no way that the guy that installed my 17016 back then could have put them in the wrong spot (I just remember him saying they were easy to get to at the time)?
Last edited by ShaneN.; 04-24-2019 at 03:00 AM.
#3
MBWorld Fanatic!
I had a code for the downstream sensors at some point. One of the heater circuits failed. ARH LTHs and EC v6 header tune. The tune shuts off the rear sensors but for some reason they still need good sensors plugged in. I replaced both and the CEL went away. I used the bosch plug and play replacements.
#4
Super Member
Thread Starter
I had a code for the downstream sensors at some point. One of the heater circuits failed. ARH LTHs and EC v6 header tune. The tune shuts off the rear sensors but for some reason they still need good sensors plugged in. I replaced both and the CEL went away. I used the bosch plug and play replacements.
#5
Super Member
Thread Starter
Literally every store in Canada I call can't get them and they're on back order. Mercedes has some on the other side of the country and they want 1.25x the price that they sell for. Does anyone see any problem using the NGK/NTK 25186? It's supposed to be the equivalent.
#6
You are correct, the Upstream (Primary) O2s are Wideband, and will have more wires, hence the plug is 6 prong male (i believe).
The Downstream (Secondary) O2s are simply oxygen sensors (without Wideband function), and their plug should be female with 4 wires.
These Downstream O2s have MB Part #: 0045420718 (Bosch 16749, confirmed on Bosch website) - the same part for both Right & Left orientations, and should work on both FL and PFL models (i believe)
Eurocharged cannot completely code out the Downstream (Secondary) O2s - my understanding is that their O2 sensing function is turned off, but their Heater circuit remains intact.
Amazon Canada shows 6 in stock
The Downstream (Secondary) O2s are simply oxygen sensors (without Wideband function), and their plug should be female with 4 wires.
These Downstream O2s have MB Part #: 0045420718 (Bosch 16749, confirmed on Bosch website) - the same part for both Right & Left orientations, and should work on both FL and PFL models (i believe)
Eurocharged cannot completely code out the Downstream (Secondary) O2s - my understanding is that their O2 sensing function is turned off, but their Heater circuit remains intact.
Amazon Canada shows 6 in stock
#7
Super Member
Thread Starter
You are correct, the Upstream (Primary) O2s are Wideband, and will have more wires, hence the plug is 6 prong male (i believe).
The Downstream (Secondary) O2s are simply oxygen sensors (without Wideband function), and their plug should be female with 4 wires.
These Downstream O2s have MB Part #: 0045420718 (Bosch 16749, confirmed on Bosch website) - the same part for both Right & Left orientations, and should work on both FL and PFL models (i believe)
Eurocharged cannot completely code out the Downstream (Secondary) O2s - my understanding is that their O2 sensing function is turned off, but their Heater circuit remains intact.
Amazon Canada shows 6 in stock https://www.amazon.ca/Bosch-16749-Ox.../dp/B000CF1XCM
The Downstream (Secondary) O2s are simply oxygen sensors (without Wideband function), and their plug should be female with 4 wires.
These Downstream O2s have MB Part #: 0045420718 (Bosch 16749, confirmed on Bosch website) - the same part for both Right & Left orientations, and should work on both FL and PFL models (i believe)
Eurocharged cannot completely code out the Downstream (Secondary) O2s - my understanding is that their O2 sensing function is turned off, but their Heater circuit remains intact.
Amazon Canada shows 6 in stock https://www.amazon.ca/Bosch-16749-Ox.../dp/B000CF1XCM