Questions tagged [o2-sensor]
Questions and discussions about oxygen (O2) sensors. Oxygen sensors are used to measure the exhaust gas concentration of oxygen for internal combustion engines in automobiles and other vehicles.
213
questions
-1
votes
0
answers
11
views
Bosch universal 02 sensor
I bought a bosch universal o2 semsorsays online it's compatible. Store also. I wasntbsure because I have a 2009 bmw 328i x drive. Has a 5 wire where this is 4. Also my color code is not on any of the ...
- 1
0
votes
1
answer
17
views
Trying separate the Oxygen Sensor electrical connector
The rear O2 sensor needs replacing. I cannot figure out how to get the connector to separate.
2017 Lincoln MKZ Hybrid
I have tried pressing on the spot I think needs it. I have tried prying up on the ...
1
vote
1
answer
31
views
"Post Catalyst Sensor Open Test" meaning
('07 Cobalt LS, 2.2L Ecotec)
In this car's 'mode 6' OBD2 data, there is a GM-defined item, "Post Catalyst Sensor Open Test" (Test ID 8A). This page shows it as a count. My scan tool also ...
- 1,113
2
votes
2
answers
115
views
O2 sensor keeps failing in 2008 Volvo V70 2.0F
The main O2 sensor keeps failing in our 2008 Volvo V70 2.0F (flexifuel/E85). We've replaced the sensor several times in the past few years. We've tried every available brand of sensor, including OEM ...
- 121
2
votes
2
answers
55
views
2002 Toyota RAV4 major emissions issue, multiple sensor faults
I’m having problems with my Toyota RAV4. I bought the car 6 months ago with a lambda sensor fault.
By time I got it home, had lambda bank 2, sensor 2 and Mass airflow sensor faults.
Changed both, okay ...
- 21
1
vote
0
answers
24
views
'05 Honda CR-V multiplexer wriring issue?
Having issues with the door lock relay decided to replace the multiplexer with one from the salvage yard. Unfortunately this did NOT fix the issue and introduced a new issue. It cause the engine light ...
- 11
3
votes
2
answers
46
views
Oxygen sensor "clean air source"?
('07 Cobalt, Ecotec 2.2L)
I came on the text below in the AllData (paywalled) service manual. It seems like they're saying that ambient air comes into the exhaust 'oxygen' sensor (pic below) ... ...
- 1,113
0
votes
0
answers
47
views
Flashing overdrive light 2002 ford escape
2002 ford escape xlt-flashing overdrive light comes on after short period of driving. Comes on when approaching 50 mph? Or so...how do I fix it?
- 1
2
votes
1
answer
97
views
Substitute oxygen sensor gasket?
'07 Cobalt, 2.2L
Replacing the (whole) exhaust. I got the (heated) O2 sensors off, but the gasket ring on the downstream one is completely buggered. Short of just replacing the sensor, does anyone ...
- 1,113
1
vote
1
answer
43
views
P0420 In Honda Civic or any other car
Just want to know about P0420 code in any car and specially in Honda.
Does that mean only that catalytic convertor is bad or any other reason too?
2
votes
1
answer
816
views
Lambda wiring diagram wrong from Bosch
I was sent a Bosch universal o2 downstream sensor however their wiring diagram does not match that of the original sensor lead which I need to chop onto.
OEM is white, red, grey and black.
Bosch part ...
- 21
0
votes
1
answer
62
views
22mm air/fuel sensor socket for Honda CR-V MK3
I am trying to find a socket to take out my air/fuel sensor but so far after having bought and tried several sockets, the sockets I tried all seem to be a bit too thick so just can't get all the way ...
- 103
3
votes
0
answers
40
views
05 Jeep Liberty V6 - Battery died, computer reset, running extremely rough. Only code is P0137, and new o2 sensor reads 0v
Title basically sums it up, I have an 05 Liberty with the V6. Battery died over the big chill last week because I left a dash cam plugged in for a few days. Once I got the car running, it was running ...
1
vote
1
answer
752
views
How damaging is to ride without a lambda sensor?
I am considering buying a motorcycle, a 2015 Yamaha MT 07. One possible problem with this bike: its lambda sensor was cut at some point in the past. I would have to replace it (which I am fine with - ...
- 111
1
vote
2
answers
640
views
Help diagnosing an O2 code - running rich, bad sensor or bad cat?
I've been (increasingly frequently) occasionally getting an O2 high voltage code for Bank 1, sensor 2 on my vehicle - P0138 (2009 toyota matrix, 1.8L). The code would often resolve itself within a ...
- 559
0
votes
1
answer
379
views
Replacing post-cat O2 sensor bmw f30
I am having some difficulties finding the location of post-cat O2 sensor (bank 1 sensor 2) in my car.
As far as I know the one in the picture is the upstrem (pre-cat) sensor and I am not sure where ...
1
vote
1
answer
77
views
Oxygen Sensor Diagnosis
I recently had the engine MIL go on on my Mercedes C-Class S205 while driving so I purchased an OBDII bluetooth scanner to figure out what is going on. The code I got was:
P2243(92) - Heated oxygen ...
- 11
0
votes
1
answer
336
views
Suzuki SX4, P0134/ P0420, sensor or CPU?
So, my friend is having car trouble with their Suzuki SX4, 2007.
I was told the car had some issue with the catalytic converter in the past. The mechanic told them it would cost $2000, but that it ...
0
votes
0
answers
420
views
High voltage on downstream O2 sensor after driving, but low voltage on idle
After driving on the highway, my downstream O2 sensor voltage was a steady 0.8V, which is high.
On the other hand, when idling before the drive, it was a steady 0.3V.
Is it normal for the downstream ...
- 113
0
votes
1
answer
289
views
Upstream O2 sensor stays at 0.4V
To test the upstream O2 sensor on a 2011 Toyota Corolla, I backprobed it with a multimeter.
After I idled the engine for a few minutes to warm it up, the multimeter shows a steady voltage of 0.4V.
But ...
- 113
2
votes
1
answer
368
views
2000 Toyota Camry P0155 Error Code
I have a 2000 Toyota Camry V6 with a California emissions package. I am getting a P0155 error on my OBD tool. This is either a O2 Heated Oxygen Sensor or An A/F sensor. I get confusing information ...
- 23
0
votes
0
answers
18
views
O2 bank 2 sensor 1 engine side female connector wiring sequence [duplicate]
In replacing the O2 sensor on my 2001 Toyota Sequoia Limited, I pulled the female connector away from the wires. I bought a replacement connector (10869) with 8" pigtail but it has all black ...
- 1
4
votes
1
answer
160
views
Should I replace oxygen sensor? Which one?
My cat recently got stolen, which was removed using an angle grinder by the thief. He took the oxygen sensor too. Hyundai Tucson 2013.
When I got new cat replaced, the car repair guy just "closed&...
- 147
3
votes
1
answer
216
views
Replaced my 5 cylinder Volvo V70 2.5l turbo engine with a 6 cylinder S80 2.9l twin turbo engine and I'm having trouble with the exhaust
Replaced my 5 cylinder Volvo V70 2.5l turbo engine with a 6 cylinder S80 2.9l twin turbo engine and I'm having trouble with what to do about the exhaust.
The original 5 cylinder had only 1 turbo, 1 ...
1
vote
0
answers
95
views
2009 H1 Hyundai 2.5 crdi turbo fluctuations
Sharing an experience.
Had a H1 turbo diesel towed to me blowing steam from radiator.
Step One.
was replace the cylinder head. Ok done.
Started engine and found there was no power.
Step Two.
Found ...
- 11
1
vote
1
answer
558
views
Rough idle and stop when I first start the engine in the morning
I have 2005' Legacy 2.0 4AT.
Problem 1
As I mentioned in the subject. When I first start to the engine it's quickly working but somehow if I try to change gear to D it stops (sometimes it's not but ...
0
votes
1
answer
158
views
Is my exhaust causing misfire or did misfire burn the exhaust?
I hope to not be too vague as I don't know a lot about cars.
I recently purchased a 1.2L Fiat Punto II 2005. It has trouble with a rough idle, a power drop off around 4krpm when accelerating and a ...
0
votes
2
answers
53
views
can an O2 sensor be leaking itself? when holding my fingers around the sensor where the wiring starts, it felt like exhaust came up from the housing
leaking O2 sensor
l fixed an exhaust leak on the “ribs” on the manifold on my 2006 chrysler 300 crd 3.0 td
when checking if the problem was solved l could still smell the exhaust and when holding my ...
1
vote
0
answers
182
views
Do I need to replace my catalytic converter or it could be exhaust leak?
I have WV Polo 1.2 petrol from late 2005 with 170k. Recently I got the check engine light and I went to non official repair service (since there isn't one in my country). They told me it's the oxygen ...
1
vote
1
answer
2k
views
Emission High CO and High Lambda
It fails at 2500rpm only with CO 0.5~0.6 and Lambda 1.04~1.05.
How can it possible be that emission fails because of HIGH CO, and HIGH lambda reading... It means that engine runs rich and lean at the ...
- 11
2
votes
0
answers
292
views
Oxygen sensor output drops to 0V
I had occasional P0134 code come up on my car (bank 1 sensor 1 no activity detected). I checked the sensor output using OBD2 and as soon as I started driving around 100kmh the output was dropping to ...
- 21
1
vote
1
answer
125
views
Upstream vs Downstream O2 sensor | Maintanance
I had my car checked up last year and the mechanic said that I will have to replace the oxgyen sensor. I at that time did not have it replaced. Recently I noticed that my car Mini Cooper 2011 started ...
- 175
4
votes
2
answers
1k
views
Do oxygen sensors degrade over time or just break?
I have a BMW E46 M3 with 100k miles that's smelling rich when cold and seems to be getting worse mileage than it used to. It has passed the UK MOT emissions check recently, the plugs seem fine and I'...
- 15.7k
2
votes
1
answer
1k
views
2007 Honda Fit Sport P0420
I backed up in a dirt lot and heard a metal scraping sound. After driving about 30 miles, the check-engine light came on with code P0420 indicating "Catalyst Efficiency Below Threshold (Bank 1)&...
- 68
1
vote
1
answer
1k
views
O2 Sensor Bad Voltage Reading? 2013 Toyota Corolla
I'm Looking at the o2 sensor data for my 2013 Corolla and don't know if B1S2 is bad or not. I've heard that o2 sensors in general should oscillate between 0 and 1 V but I've also heard that for newer ...
- 11
1
vote
0
answers
315
views
Possible causes of rough idle after changing Oxygen sensor...?
Got a 2005 Acura TSX 2.4L that I changed the upsstream Oxygen(Air/Fuel ratio) sensor after the check engine light came on. Since than, the car has never run the same. Engine idles very poorly (...
- 11
1
vote
0
answers
52
views
Engine feels like it will stall after Air/Fuel ratio sensor changed?
Got an 04 Acura TSX that's been baffling me for the couple of weeks. Accidentally bought an Upstream Oxygen sensor instead of the downstream so I thought might as well replace it since I have it (keep ...
- 11
2
votes
2
answers
3k
views
What is the standard size thread for O2 (lambda) sensors?
I may be purchasing aftermarket headers for one of my projects. Most of the options I care to look at do not have O2 sensor bungs welded in them, so I'd have to purchase some and weld them in so the ...
- 152k
0
votes
1
answer
702
views
Coolant vs. air fuel ratio or O2 sensor
If there's a trace of coolant getting into the cylinder combustion chamber what would the effect be on the AFR or O2 sensors fitted to the exhaust pipe?
I'm guessing zirconium sensors would read rich ...
- 474
1
vote
1
answer
82
views
Is LambdaB1S1 the same as Upstream O2?
I have an Innova 3040C scan tool and a 2013 Hyundai Accent. Under live data I have O2B1S2 which I believe is the downstream O2 sensor. Oddly there is no O2S1B1 listed. There is a LambdaB1S1 voltage ...
- 21
2
votes
0
answers
426
views
Are my cats bad? -- secondary O2 sensor voltage
I have a 2002 BMW M3, and I've been trying to track down a poor fuel economy issue for quite some time now. My long term fuel trims are high (+7%-10%), and when I had the car on the dyno a couple ...
- 21
0
votes
0
answers
64
views
What are best steps to diagnose a bucking engine/
My 1992 Nissan with SR20DE (2.0 liter 143 HP o2 and MAF equipped OBD I engine, 16 valve, fuel injected), bucks. I own this car for ten years now and a lot has been replaced. Not always in attempt to ...
0
votes
1
answer
213
views
Faulty O2 sensor identification
The car is a 2006 BMW 325i (N52B25 engine). The problem started out as a performance issue (car didn't pull quite that hard), after a while it turned into more serious issues like low rpm stuttering/...
- 280
2
votes
0
answers
164
views
o2 sensor readings don't make sense to me
I get these readings as showed in the graph below from both o2 sensors and I am having a hard time to interpret them, especially sensor 2 (downstream). The readings are from a short drive around town (...
- 63
2
votes
0
answers
428
views
2001 Camry P1135 Cause
Sorry in advance for the long post.
My check engine light in my 2001 Camry 4cyl recently came on with code P1135. Google shows that this is usually a faulty sensor. However, I noticed on some posts ...
- 21
2
votes
0
answers
415
views
Reoccuring Check Engine Light (P0135 (Oxygen Sensor Heater) - 2000 Toyota Camry V6
Here is the situation:
I have a 2000 Toyota Camry V6 (not California model) with a reoccurring check engine light. The code is P0135 - Heated Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)...
- 21
2
votes
0
answers
48
views
Bmw N52N Lambda probes madness
Owner of a BMW E60 523i LCI Automatic (N52N engine. aka N52k). 105000 Kms on the clock.
The error codes below after deletion, re-appear after 300~400 Kms.
It is theoritically impossible for 4 lambda ...
- 121
1
vote
0
answers
32
views
Changed AF sensor and O2 Sensor but Check Engine Light still on (P0138)
I recently had a CEL come up on my 2015 Corolla S CVT. It was code P0138 so with my mechanic's recommendation, I ended up changing both the AF sensor and the downstream O2 sensor with Denso OEM parts. ...
- 11
0
votes
1
answer
144
views
O2 sensor not connected
Just change manifold on an 2002 Hyundai santa fe. One of the o2 sensor is not hook up. The car start ed drive around corner car act like it was choking and stop. Now car wont start up
- 1
3
votes
1
answer
669
views
Does an oxygen sensor's lambda value represent the same when running on LPG?
I have converted my car to LPG, and i've been tuning it today with a wideband lambda controller. It runs pretty okay, but i'm not yet satisfied.
The weird thing is, it accelerated best when the ...
- 2,929