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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36 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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22 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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25 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 ...
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855 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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1answer
70 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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35 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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77 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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34 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 ...
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34 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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13 views

AFR vs incorrect Lambda sensor?

re: 2007 Subaru 3.0 LL Bean 6 cylinder I'm chasing negative long term fuel trims and knock but my car had the pre-cat exhaust sensors replaced at a local shop couple of years back which are marked ...
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54 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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20 views

02 sensor electrical connectot

I have a 2013 Chevy malibu and I am replacing the o2 sensor but my problem is disconnecting the electrical connector. I pulled the white clip up and tried disconnecting but it doesn't work. I dont ...
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28 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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63 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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25 views

2012 Toyota Prius O2 Bank 1 Sensor 2

I recently received a P0138 code for my 2012 Toyota Prius. My diagnostic tool says its the "O2 Sensor circuit Hight voltage Bank 1 Sensor 2". Is this the same as the "downstream" I keep hearing? ...
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35 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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74 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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138 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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53 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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166 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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28 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 ...
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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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49 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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103 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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1answer
180 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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2answers
66 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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500 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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1answer
363 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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1k views

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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64 views

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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115 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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1answer
85 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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157 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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1answer
128 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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49 views

2008 chevy 2500HD 6.0L

Rear O2 sensor plug on drivers side has been torn off of the main harness leaving only two wires left to go to the O2 sensor. O2 sensor appears to have had 4 wires coming from it. How do I rewire ...
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338 views

Matching up connections on O2 Sensor for 2001 Honda Accord

I purchased a new O2 Sensor for my 2001 Honda Accord and I cannot understand why it has a female plug and not a male plug as the existing one has so I assume I have to move the wires from the new unit ...
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351 views

Nagging P0430 (and now a pending P0420 too!) 2004 Lexus ES330

I've got a 2004 ES330 (2nd owner) with roughly 315,000. We didn't pay much for the car in 2012 with 164,000 miles. So, i've never gone overboard in maintenance of it. A year ago, when it was time for ...
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305 views

HP Tuners disable downstream O2 sensors (FAOSC)

I deleted my catalytic converters on my Ford Taurus 2013 N/A because was giving p420 CEL, and tuned with HP Tuners to disable CEL from p420 , p430 and disabled catalyst test and downstream O2 heaters ...
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194 views

How can I swap wires/pins on generic aftermarket O2 sensors?

I purchased some generic aftermarket O2 sensors for my 2002 Land Rover Discovery 2, which were significantly cheaper than the "official" Land Rover replacement parts. Unfortunately after installation,...
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44 views

AF/O2 and Fuel Trim data - Normal or not?

I'm learning to diagnose my car's poor gas mileage: Car: 2010 Toyota Matrix (Base). Engine: 1.8L, 4 cylinders, Auto, FWD. ODO: 103,000km (64,000 miles). City gas mileage: 12.6L/100km = 18.6 mpg (...
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1answer
2k views

2005 toyota camry 3.0l bank 1 sensor 2 where is it

i have a 2005 toyota camry v6 3.0l it needs a bank 1 sensor 2 where is it or which one on the exhaust is it. im not sure about words like downstream just want to make sure
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1answer
60 views

Should my check engine light be on if an O2 sensor is physically absent?

I have a 2009 Pontiac Vibe. The Check Engine light was on and I took it in to a mechanic. He told me that the downstream O2 sensor was not responding and that he physically removed it. He said that ...
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1answer
604 views

Can I interchange the two downstream o2 sensors?

I got a new catalytic converter for my Honda Civic 2005 HX car because the "coal" inside went lose and was just making noise inside of it. While trying to take off the old O2 sensor I ended up ...
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221 views

What causes narrowband O2 sensor behaviour?

It's a given that narrowband O2 sensor (Lambda) output swings up and down within the 0-0.9v range, but everywhere (on the 'net including here) I am seeing people say this is due to the ECU in closed ...
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104 views

Loss of Power and increased engine knock in my 2011 Ford Ranger Truck. Bad Gas or Bad Oxygen Sensor?

This past summer I've been noticing that my truck is not making the same power as it used too and I've noticed a pronounced increase in engine knock (detonation). The detonation usually occurs when I ...
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136 views

o2 sensor problem

I have a SEAT Toledo 1.6L 16V with engine code AZD. I was getting an error code for the Bank1 Sensor1 because of a blown fuse but I didn't know that then and I replaced the Bank1 Sensor 1 with this ...
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46 views

Does anyone know the OEM for the 2006 Infiniti qx56 oxygen sensors

I've got the part numbers and some cross references for the 2006 Infiniti QX56 oxygen sensors, but I would like to buy from the OEM. Bosch? Denso? infiniti front left/right 226937S000 bosch 17204 5 ...
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64 views

Check engine light won't stay off

I've attempted to get my check engine light fixed a couple times and at each repair facility they've scanned the code and told me it was a bad oxygen sensor. I had the oxygen sensor replaced at both ...
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204 views

p0140 and p0172

I have a 2005 Elantra (205K miles). I replaced the second o2 sensor (downstream; after cat), added a defouler to second o2, replaced cylinder # 2 injector, air filter, tune-up. If the car is at idle ...
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1answer
3k views

Loosening O2 sensors with brake fluid?

So my 2010 Prius recently got a code for the upstream O2 sensors heater circuit (P0031) and I tested the heating coil and the circuit is not complete so I ordered a new one. The old one obviously is ...