O2 Sensor Keeps needing replacement

[spr]

Fyi I had the thermostat failure and codes at the same time. The oem thermostat or replacement is not that cheap the mahle is like 65 oem like 100+ for best prices.



QUOTE=JsL;21360141]Sometimes a bad themostat or coolant temp sensing can cause O2 faults. Are there any pending themostat or coolant temp faults? Does your engine oil take a long time to warm up in the morning?

The oem themostat is 40 bucks and the oem coolant temp sensor is 30 bucks. It's 3 hours labor to change both. Might be worth a shot [/QUOTE]

[SHADY1]

Originally Posted by JsL

Sometimes a bad themostat or coolant temp sensing can cause O2 faults. Are there any pending themostat or coolant temp faults? Does your engine oil take a long time to warm up in the morning?

The oem themostat is 40 bucks and the oem coolant temp sensor is 30 bucks. It's 3 hours labor to change both. Might be worth a shot

Thanks for the advice but I don't have any coolant temp fault codes, and the engine oil don't take long to warm up . I just have those 4 O2 sensors codes. I can clear those codes drive the car any distance short or long distance, for example I drove 100+ miles today non stop. I had no faults popping up, no service engine soon light, no increased emissions fault. The moment I cut the car off and cut it back on same faults are back service engine soon light and increased emissions .

Thanks for the advise on the thermostat and coolant temp sensor but since I don't have these faults on the car. I hate to spend 3 hours changing them for nothing if they are not broke. I will keep your advice in mind.

[burnrbr]

Originally Posted by SHADY1

Thanks for the advice but I don't have any coolant temp fault codes, and the engine oil don't take long to warm up . I just have those 4 O2 sensors codes. I can clear those codes drive the car any distance short or long distance, for example I drove 100+ miles today non stop. I had no faults popping up, no service engine soon light, no increased emissions fault. The moment I cut the car off and cut it back on same faults are back service engine soon light and increased emissions .

Thanks for the advise on the thermostat and coolant temp sensor but since I don't have these faults on the car. I hate to spend 3 hours changing them for nothing if they are not broke. I will keep your advice in mind.

I read somewhere that a bad secondary air pump can cause O2 sensor codes. Since you only get the codes during startup, it could be your issue.

[spr]

You try low fuel pressure sensor?

[SHADY1]

Originally Posted by burnrbr

I read somewhere that a bad secondary air pump can cause O2 sensor codes. Since you only get the codes during startup, it could be your issue.

Thanks I will keep this in mind

Originally Posted by JsL

Sometimes a bad themostat or coolant temp sensing can cause O2 faults. Are there any pending themostat or coolant temp faults? Does your engine oil take a long time to warm up in the morning?

The oem themostat is 40 bucks and the oem coolant temp sensor is 30 bucks. It's 3 hours labor to change both. Might be worth a shot

I think I will try this next starting with the coolant temp sensor .

[araaadi]

mine turned out to be a bad egr valve near secondary air sensor, parts costed less than $200 but it was 9 hours of labour =(

[tokic_o]

Originally Posted by araaadi

mine turned out to be a bad egr valve near secondary air sensor, parts costed less than $200 but it was 9 hours of labour =(

How did you or your mechanic diagnose this? For me I'm getting the same code for the O2 sensor I JUST replaced...

[SHADY1]

Originally Posted by JsL

Sometimes a bad themostat or coolant temp sensing can cause O2 faults. Are there any pending themostat or coolant temp faults? Does your engine oil take a long time to warm up in the morning?

The oem themostat is 40 bucks and the oem coolant temp sensor is 30 bucks. It's 3 hours labor to change both. Might be worth a shot

I replaced the Coolant temp sensor..!!! it did not work

Originally Posted by spr

You try low fuel pressure sensor?

I replaced the low fuel pressure sensor...!!! it did not work

I can clear these current faults drive 0 miles to 100 miles or more. The moment I turn my car off and turn it back on the faults are there service engine soon, increased emissions. I think I am about done screwing around with these faults at the moment

[Locksmythe]

Originally Posted by SHADY1

I replaced the Coolant temp sensor..!!! it did not work




I replaced the low fuel pressure sensor...!!! it did not work

I can clear these current faults drive 0 miles to 100 miles or more. The moment I turn my car off and turn it back on the faults are there service engine soon, increased emissions. I think I am about done screwing around with these faults at the moment

I have not seen other discussions of the heater control readings from O2 sensors other than yours. How is your gas mileage compared to prior to getting the codes? I have seen reports of false errors for O2 sensors due to leaks in intake/header but they manifest as oxygen issues, not heater control. Do your headers perhaps cause a heat issue?

I am curious about the OPs egr valve solution, though, as I have had the same sensor go out again myself. I cannot find a DIY to describe that work.

[Patrón]

Originally Posted by SHADY1

I replaced the Coolant temp sensor..!!! it did not work




I replaced the low fuel pressure sensor...!!! it did not work

I can clear these current faults drive 0 miles to 100 miles or more. The moment I turn my car off and turn it back on the faults are there service engine soon, increased emissions. I think I am about done screwing around with these faults at the moment

sorry to hear buddy. is there a possibility that the new headers have a leak at one of the manifolds? there's a lot of bolts on those beauties, perhaps a few came loose from the recent install.

[SHADY1]

Originally Posted by Locksmythe

I have not seen other discussions of the heater control readings from O2 sensors other than yours. How is your gas mileage compared to prior to getting the codes? I have seen reports of false errors for O2 sensors due to leaks in intake/header but they manifest as oxygen issues, not heater control. Do your headers perhaps cause a heat issue?


I am curious about the OPs egr valve solution, though, as I have had the same sensor go out again myself. I cannot find a DIY to describe that work.

The gas mileage was not good when I had the first set of codes.

P0037: HO2S Heater Control Circuit Low Bank 1 Sensor 2
P0057: HO2S Heater Control Circuit Low Bank 2 Sensor 2
P0030: HO2S Heater Control Circuit Bank 1 Sensor 1
P0050: HO2S Heater Control Circuit Bank 2 Sensor 1

These faults are no longer there.

The new faults:

273F: DME Oxygen sensor final stage diagnosis heater before cat converter, bank 2
272C: DME Oxygen sensor, output-stage diagnosis heater behind cat bank 1
273E: DME Oxgen sensor final stage diagnosis heater before cat converter bank 1
272D: DME Oxygen sensor output-stage diagnosis heater behind cat bank 2

These new faults are not effecting the fuel mileage I can even clear this code and it stays gone until I turn the car off and then turn it back on the code is immediately there: service engine soon, increased emissions

This is the crazy thing that is killing me that it is a heat control issue I don't know what is causing this fault. My Headers are not causing a heat issue the few other people I know with headers are not having this problem.

Originally Posted by Patrón

sorry to hear buddy. is there a possibility that the new headers have a leak at one of the manifolds? there's a lot of bolts on those beauties, perhaps a few came loose from the recent install.

No faults with the headers bro nothing is loose. What ever is causing the O2 sensor heat control has to be some type of sensor. It don't matter if the car is hot or cold this fault is getting on my last nerve at the moment

[Locksmythe]

Originally Posted by SHADY1

The gas mileage was not good when I had the first set of codes.

P0037: HO2S Heater Control Circuit Low Bank 1 Sensor 2
P0057: HO2S Heater Control Circuit Low Bank 2 Sensor 2
P0030: HO2S Heater Control Circuit Bank 1 Sensor 1
P0050: HO2S Heater Control Circuit Bank 2 Sensor 1

These faults are no longer there.

The new faults:

273F: DME Oxygen sensor final stage diagnosis heater before cat converter, bank 2
272C: DME Oxygen sensor, output-stage diagnosis heater behind cat bank 1
273E: DME Oxgen sensor final stage diagnosis heater before cat converter bank 1
272D: DME Oxygen sensor output-stage diagnosis heater behind cat bank 2

Those are the same faults. Check the sticky thread for mapping of BMW faults to OBD codes. Those are the same issue.


I doubt that you would have broken all 4 sensors on install, so I would look for a cause elsewhere in the system. Do you have modified code installed to compensate for the lack of primary cats? Could that have set out of range heat sensor checks that will always fail?

[Patrón]

Originally Posted by SHADY1

The gas mileage was not good when I had the first set of codes.

P0037: HO2S Heater Control Circuit Low Bank 1 Sensor 2
P0057: HO2S Heater Control Circuit Low Bank 2 Sensor 2
P0030: HO2S Heater Control Circuit Bank 1 Sensor 1
P0050: HO2S Heater Control Circuit Bank 2 Sensor 1

These faults are no longer there.

The new faults:

273F: DME Oxygen sensor final stage diagnosis heater before cat converter, bank 2
272C: DME Oxygen sensor, output-stage diagnosis heater behind cat bank 1
273E: DME Oxgen sensor final stage diagnosis heater before cat converter bank 1
272D: DME Oxygen sensor output-stage diagnosis heater behind cat bank 2

These new faults are not effecting the fuel mileage I can even clear this code and it stays gone until I turn the car off and then turn it back on the code is immediately there: service engine soon, increased emissions

This is the crazy thing that is killing me that it is a heat control issue I don't know what is causing this fault. My Headers are not causing a heat issue the few other people I know with headers are not having this problem.




No faults with the headers bro nothing is loose. What ever is causing the O2 sensor heat control has to be some type of sensor. It don't matter if the car is hot or cold this fault is getting on my last nerve at the moment

Call Will at Mtechnik and give him your codes, see if he has a suggestion.

good luck with your fix.

[araaadi]

Misfiring again.. not sure what now.

[araaadi]

dp.

[111turbo]

Check for exhaust leaks. I had similar codes thrown and the header/exhaust area was loose. Tightened it back up and codes stopped popping up. Check your gaskets they might be loose/melted. I had to replace both of them.

[Patrón]

Originally Posted by 111turbo

Check for exhaust leaks. I had similar codes thrown and the header/exhaust area was loose. Tightened it back up and codes stopped popping up. Check your gaskets they might be loose/melted. I had to replace both of them.

that was my thought as well. Or leak at the heads...?

[tokic_o]

This may sound dumb.....but I had some misfiring error codes like yours above and it was my spark plugs. Replaced all 8 and everything is fine now.

[111turbo]

These are how my gaskets looked at 39xxx miles that caused limp mode sporadically. Just replaced them and now the car runs fine.

[araaadi]

Apprently my secondary bank two o2 sensor is not getting any signal anymore, they're gonna replace it but they're thinking there's a reason why it keeps dying. Any ideas?

[Locksmythe]

They let an untrained tech change it and they twisted up the cables instead of screwing it in before plugging it in.

[GSTE34]

I had a coil die after exhaust install now I'm getting misfiring codes for 3 and 5 even when I move coils around still says 3 and 5 are misfiring my plugs are new as well and I'm getting pissed off 😤 Would the ground straps on the exhaust have anything to do with it?