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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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 ...
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14 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 ...
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23 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 ...
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Problem with P0159 code Chrysler Pacifica

Helo I have replaced the catalytic converter with a non original one because i didn't find an original part in Iraq it was stolen ... previously I had p0430 ... but now I have p0159 which refers to ...
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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 ...
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22 views

Diagnosing o2 sensor data

I have a Renault twingo 95 with a monopoint injection and one o2 sensor. The o2 sensor is one year old. What should I check to find why it doesn't fluctuate on idle?
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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 ...
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57 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 ...
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Steady, low voltage on pre-cat O2 sensor while idling, but voltage increases upon revving

To test my pre-cat O2 sensor, I unplugged its connector from the ECU and stuck a voltmeter’s probes into said connector. When I let my engine idle, my voltmeter shows a steady low voltage, oscillating ...
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43 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 ...
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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 ...
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104 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&...
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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 ...
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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 ...
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54 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 ...
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64 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 ...
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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 ...
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Lambda readings on emission

I've just failed mine on a mk4 golf 1.8t readings come back at Co 0.00 Hc 0 ppm Lambda 1.044 Garage have said lambda sensor aswell as hole in exhaust right in the join to the back box I scanned it ...
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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 ...
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527 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 ...
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48 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 ...
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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 ...
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942 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'...
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434 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)&...
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440 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 ...
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244 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 (...
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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 ...
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171 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 ...
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141 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 ...
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33 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 ...
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112 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 ...
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50 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 ...
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123 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/...
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149 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 (...
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205 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 ...
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282 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)...
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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 ...
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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. ...
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83 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
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257 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 ...
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441 views

My new Oxygen Sensor package does not include copper anti-seize

My new Oxygen Sensor package does not include copper anti-seize. I know that is is a good practice, and most S2 sensors come with an anti-seize paste. I have this anti-seize that I use for my brake. ...
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74 views

Oxygen Sensor Engine Light

I had Oxygen Sensor Engine Light that complained about the Bank 1 Sensor 1. I used my OBD2 tool to clear the code, and the engine light is not coming back. Can I leave the sensor as is or still I ...
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849 views

Car hesitating while accelerating at low speeds and check engine light is on constantly. Why? [closed]

2001 Subaru Forester hesitating while accelerating at low speeds and check engine light is constantly on.
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713 views

Difference between banks for AFR & O2 sensor values

This is a well maintained 2007 Subaru with 140k km on the 3.0 litre six cylinder EZ30R engine. She's running a little scratchy most noticeable when cruising although no codes or anything. I decided ...
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Is it possible for an oxygen sensor spacer to cause a car to stall?

VW CC 2010 2.0L CBFA I installed an O2 sensor spacer on my downstream O2 sensor and it seemed to be working for a day. One day later, after the car had cooled down it would rough idle and stall when i ...
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Where are the O2 Sensors in a VW with 3 sensors?

My VW CC 2010 2.0L Sport CBFA has three oxygen sensors and two catalytic converters. The CCTA version has 2 oxygen sensors and one catalytic converter. Since the engine is in a transverse 4 ...
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130 views

Engine lean issues

Vehicle is a 2006 Ford Courier, started having hesitation/loss of power after fill up at a gas station that I'd never been to before. I depend on it for transport so I'm forced to still drive it, ...
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91 views

Do I need to replace my O2 sensor?

I bought a 2008 Nissan Versa LS last month. It has 235,500 kilometres on it but the engine and transmission run quite well. Last week, the “Service Engine Soon” light came on when I started it up ...
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580 views

2003 toyota sequioa oxygen sensor upstream color code diagram

2003 toyota sequia 4wd engine side the harness connector ripped, i need the color code.Engine side the wires are green with red stripe, green with white stripe, black, white I dont know how to rewire ...
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246 views

Test 3 wire NTK, Bosch O2 sensor signal after heat up, but, not signal. Why?

I have a 1996 Nissan Altima O2 + Catalytic converter not ready. I want make sure O2 sensor really work. Upstream sensor (before CAT) work by measuring voltage when heated up with torch. Downstream ...

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