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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.

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Down stream oxygen sensor wiring code

I had my catalytic converter stolen on my 2013 Toyota Tacoma and they cut the oxygen sensor wires so I bought one from e bay and the down stream sensor also my problem is I don't know how to match the ...
Oscar's user avatar
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1 answer
36 views

Recurring code P2196, but seemingly OK oxygen sensor, on 2012 Volvo C30

My 2012 Volvo C30 T5 has been having a recurring engine code P2196 (O2 Sensor Stuck/Biased Rich) for some time now. It has popped up on four or five separate occasions. I usually clear it, but one ...
ivorysoap's user avatar
1 vote
1 answer
23 views

1995 jimmy can't get c02 sensor off

Can't get c02 sensor off 1995 chevrolet jimmy. Iv tried driving it to heat it up, sprayed it with WD-40, went and bought the "special socket", and it still won't come off. PLEASE HELP.
Angela Berg's user avatar
1 vote
1 answer
47 views

O2 vs Air/Fuel Sensors?

I have a CEL with (apparently really common) codes P0420 and P0430, i.e. issues detected with both catalyst system banks. My vehicle is a 2007 Toyota 4Runner (Limited, 2WD, 6-Cyl) with about 150K on ...
AA040371's user avatar
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1 vote
1 answer
64 views

Driving without the second lambda sensor

I recently had a problem with the catalytic converter in my Nissan Pixo (UK Registration) and Mechanic told me to replace it. I usually buy original spare parts for my car from India as my car was ...
Mano Haran's user avatar
1 vote
1 answer
697 views

(H-LP RH HI) On fuse panel. What is it used for?

What does "H-LP RH HI" mean for a 20A fuse? Where can I find the o2 sensor fuse? Toyota Camry 6 cylinder.
Arif Khaled's user avatar
3 votes
1 answer
97 views

Corolla oxygen sensor welded to manifold, engine light goes off when parked nose up

My Corolla 2006 had the engine light come up, and the code PO 171. I changed the mass air flow sensor, and a mechanic tried to change the oxygen sensor but he told me that it was welded to the the ...
Cynthia's user avatar
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3 answers
65 views

MAF and MAP location

I have a 2000 Pontiac sunfire se 2.2 I’m having trouble locating the MAP and MAF sensors. The mechanic I took it to said he can’t work on my car cause it didn’t stall enough while driving my car.. ...
Christie Holstein's user avatar
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1 answer
59 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 ...
hwcurtice's user avatar
1 vote
1 answer
63 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 ...
George's user avatar
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2 votes
2 answers
226 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 ...
ntoskrnl's user avatar
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2 votes
2 answers
144 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 ...
LEP's user avatar
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1 vote
0 answers
50 views

'05 Honda CR-V multiplexer wiring 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 ...
mattinnc's user avatar
3 votes
2 answers
69 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) ... ...
George's user avatar
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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?
Scott's user avatar
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2 votes
1 answer
201 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 ...
George's user avatar
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1 vote
2 answers
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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?
Ali Choudhary's user avatar
2 votes
1 answer
2k 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 ...
James's user avatar
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0 votes
1 answer
205 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 ...
ld_pvl's user avatar
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3 votes
0 answers
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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 ...
abakedapplepie's user avatar
1 vote
1 answer
1k 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 - ...
essay's user avatar
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1 vote
2 answers
3k 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 ...
Brydon Gibson's user avatar
0 votes
1 answer
575 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 ...
anon-panda's user avatar
1 vote
1 answer
134 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 ...
Andrew's user avatar
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0 votes
1 answer
629 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 ...
user64947's user avatar
0 votes
0 answers
545 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 ...
Asker's user avatar
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0 votes
1 answer
501 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 ...
Asker's user avatar
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2 votes
1 answer
609 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 ...
D. Scruggs's user avatar
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0 answers
22 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 ...
Bryan's user avatar
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4 votes
1 answer
215 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&...
10101010's user avatar
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3 votes
1 answer
269 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 ...
Adam Dahlvang's user avatar
1 vote
0 answers
152 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 ...
leon reihana's user avatar
1 vote
1 answer
1k 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 ...
Semih Aydogan's user avatar
0 votes
1 answer
427 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 ...
Jordan Fagan's user avatar
0 votes
2 answers
58 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 ...
user61837's user avatar
1 vote
0 answers
249 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 ...
lowselfesteemsucks's user avatar
1 vote
1 answer
3k 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 ...
John's user avatar
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2 votes
0 answers
461 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 ...
Polo's user avatar
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1 vote
1 answer
207 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 ...
gfdsal's user avatar
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4 votes
2 answers
2k 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'...
GdD's user avatar
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2 votes
1 answer
2k 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)&...
Winnie Law's user avatar
1 vote
1 answer
2k 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 ...
Mapl20's user avatar
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1 vote
0 answers
354 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 (...
John Wilkkis's user avatar
1 vote
0 answers
69 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 ...
Noah's user avatar
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2 votes
2 answers
5k 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 ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
0 votes
1 answer
948 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 ...
ajayel's user avatar
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1 vote
1 answer
125 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 ...
soulTower's user avatar
2 votes
0 answers
525 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 ...
user9999's user avatar
0 votes
0 answers
66 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 ...
Richard Cedric's user avatar
0 votes
1 answer
286 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/...
galingong's user avatar
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