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.

43 questions with no upvoted or accepted answers
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308 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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My BMW X5 won't stay running

Hello I have a 2003 BMW X5. I just got the engine replace a couple days ago. I went to pick it up but because the shop was done installing the motor but now I have to deal with the other problems I ...
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Gasket Shellac on Flange gasket Dripping on O2 sensor Jeep XJ

Background I recently replaced some cracked headers on my Jeep XJ. When attaching the new headers to the exhaust with a flange gasket I didn't slide the graphite gasket ring on correctly and it went ...
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What is the normal voltage of 5-wire oxygen sensor (lambda probe)?

I have got a 2007 Opel Vectra GTS 2.2 Direct car (which still has a high pressure fuel pump problem, yet to be solved). Petrol, 114 kW, engine Z22YH. After getting an P0130-52 (No Plausibility ...
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P0420 Catalyst efficiency below threshold bank 1 With CO emission only!

I saw this code in OBD2 scanner on Skoda Fabia 1.2 2006 64hk petrol. It doesn't matter to me except that the car failed the inspection and I'm not allowed to drive it any more. The problem was too ...
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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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134 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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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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130 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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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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106 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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281 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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132 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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333 views

2001 Toyota Rav4 O2 sensor change

When changing O2 sensor B1 S2 on 2001 rav4 do you have to loosen the engine mount to access sensor with o2 socket, or is there an easier way?
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2002 Nissan Sentra XE (1.8) bogs down under heavy acceleration

This is my first time asking for help here so please bear with me. As the title says, my 2002 Sentra XE bogs down when my try to accelerate hard. It's more noticeable from a stop, but seems to do ...
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Affect of burning oil on O2 Sensors

I got a P0420 code and took my car to have a service and an investigate. I was told my car failed an emissions test and that is likely because the O2 sensors have failed causing a rich mix and higher ...
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Translating raw CAN responses into meaningful min/max/value

http://www.scangauge.com/support/x-gauge/xgauges-for-cansf-vehicles/ This website lists data reported by certain sensors. Lets take an example: Gauge = Short Term Fuel Trim Bank 1 TXD = 07E00106 ...
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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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40 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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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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63 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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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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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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202 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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25 views

1996 Infiniti g20 fails smog

I am the original owner of this CA car, and have been gradually having higher HC readings on smog checks. It failed in 2016, cleaned out the Air flow components; it passsed, but this increased the NO ...
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212 views

Variance - What is on the Vehicle and what the FSM states

2007 Honda Accord Manual Transmission DTC indicated: P1157 Usual remedy is to replace the oxygen sensor But I wanted to follow the diagnostic tree in the service manual until I discovered something ...
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1answer
40 views

O2 sensors located

need to know on a 2012 dodge caravan sxt v6 where are the o2 sensors located. Esp. upstream sensor 1 bank 1? Tried to look for them from above but no luck so far.
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1answer
138 views

2001 VW Beetle 02 sensor car will not go over 65mph

I have a 2001 VW Beetle 2.0 engine with 171,000 miles on it. I have a check engine light on saying that bank 1 lean. It has been like this for years and I have had no problem with it. Yesterday I ...
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87 views

Frequent Oxygen Sensor dirty problems (volvo diesel)

I have a volvo S60 diesel for 10 months (more than 30.000 Km), and I already have to clean the oxygen sensor once and seems that I have to clean it again. My question is what can I do to reduce the ...
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50 views

Need help fast with my truck please

My 1994 dodge Dakota v8 starts fine and ildes fine. If I drive for about 10m my engine light comes on and my code for the 02 sensor goes off. My truck is straight piped and has no cat it has a steel ...
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145 views

1991 Chevy Astro - O2 Sensor and Low Compression

I have a 91 Chevy Astro van with 15x,xxx miles. It idles very rough and drives extremely poorly at around 40mph, and, overall, seems to lack a bit of power. A compression test was performed on the ...
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11 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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1answer
46 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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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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19 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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34 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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1993 Eagle Vision o2 sensors

We have a 1993 Eagle Vision, 150k miles. We need to get current tags, but the car will not pass emissions. We have changed out spark plugs and wires, oil change, air filter, gas cap, misc other.... ...
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1answer
39 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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1answer
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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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226 views

O2 Sensor Voltage Output

I have an Acura legend (1995) that I did a header swap on and replaced the o2 sensors. They aren’t connected as of now and the car is running rich because of it. If I wanted to trick the car into ...