thunderca

I have changed my 1998 Pathfinder R50 2 rear O2 sensors. Since you have 1999, it should be the same as my pathfinder. There are 4 oxygen sensor. There are 2 location before the catalytic converter ( You should be able to see them when you have your hood open. There are 2 after the catalytic converter ( You will need to climb under your car to see them). The O2 sensors might be hiding under your heat shields (Just look for wire coming out of your exhaust pipe). They are fairly simple to change. First you have to find out which O2 sensor is bad with a ODB2 reader. Buy the O2 sensor, I got my around $90 CAN each (Bosch is the OEM brand). Some say you should change your O2 sensor in a pair so that it will have balance reading. Remove the 02 sensor is pretty easy just put put some lub, unscrew them and put a new one in with some anti-sized compound. Re-wire it and you are reading to go. It took me a few hours with some help from for the wiring. I have a thread in the forum you should be able to find it.

I get 12Litres/100km for highway 17Litres/100km for local

Sorry I am kind of new. But how do you grease Propeller shaft? What kind of tools do I need and where do i put the grease to? It is a regular maintenance described in the nissan ower manual. I can't any information on how to do it? If you know how to do that please let me know. Thanks

Man I found another problem. I jack up my truck yesterday and i found broken Strut Boot on both suspension. The one on driver side is toally broken and the passanger side was cracked. I just had my 2 strut replaced 3000km ago. The looser mechanical didn't changed that for me when he should have seen sign of wear. He should have notice the problem when he changed it. Man he will never touch my car again. Is there anything that I can do? If I go back to him I think he will just say they are just broken now and make me pay for the fix. Is broken strut boot not necessary to get fix?

I just had a friend looked at my car. He said not to worry about it. If my radiator don't get overheated then just leave it as is. He said that the vibration could be anything. It could be a belt too tight. Which he thinks my belt is a little too tight. He said it could be something the mechanic had done inside. So I think I will take my friend advice and just leave it as it. As for my truck, I have 14400km or 87010 miles on it. I don't think that is that much. I was looking up the price for fan clutch. It will cost me over $100 us just to get the parts. That is an expensive part. So i will leave it as is until i get overheat. And as for why i blame all the problems to my mechanics? I have heard too many bad storys about mechanics. My situation seems to find into theses storoes. My car have never had so many problems before. It was running just fine before I get my timming belt change. After the timming belt, I had all these problems. All these problems are related to the things my mechanics had touched. I told him to take out my heat shield. Done! and then my o2 sensors die. I told him to change timming belt and water pump, Done! and now he say the fan clutch is dying. Every where he touched seems to create problems for me. I will definally not bring my car to him to get anything fix again. My mechanics is suppose to be a friend of a friend. But that doesn't seem to matter.

I went back to the mechanic and told him that I am getting vibration at 1k rpm. He looked at it, rev the engine a few times. Pop open the hood, rav the engine a few times again. He told me there is a problem with my Fan Clutch. He said it is not serious and it doesn't need to be replace fast. Then he saw my O2 sensor wire, I saw him stares at it for a long time. Then he said he has to go talk to another customer. He ran inside and come back in 2 mins. (He probally ran into his office to find his paper work to see if he actually did the o2 sensors.) He came back out while I was try to feel what he feels on the fan. He asked me if i could feel it loose? I saw not really then he asked me if I got all my O2 done? I said yea I did it myself. He was impreased and said oh this is not too hard you could do this youself too. I think he was pissed. But what the heck, I don't think he has done his job propally (I went home and play did what he did and I think he is right the fan clutch is loose). After my timming belt changed I have 2 problems, 1st the o2 now this fraken fan clutch. This fan clutch will cost me over 100US just for parts. I think he must have messed it up when he took out all the belt in my car. After my timming belt change he told me he had also replaced another belt for me for free. I think that free belt must be the belt that drives this fan. I think he must have a hard time putting it on and he screw up something and thats why he had to replace this belt too. What do u guys things? Am i guessing it correctly? Now I have to spend another 100 dollars. This is rediculous. I had no proved that he actually broke the parts too. May be I will try to fix that next week since I am on holiday.

I don't notice gain in my gasmilage after getting a K&N filter on.

Thanks the the O2 sensors explaination. I read somewhere before than the O2 at the back does not effect on fuel management. Now that you have explained it, I understand why. After driving for a while getting the o2 sensor changed I still notice that at 1k rpm I still get that vibration. It is pretty anoying when I am driving in the traffic. What should I do? Should I take it back to the same mechanic and have him look at it and make him fix it? I am just worry that he didn't do my timming belt propally. Could someone actually do the timming belt incorrectly and the truck can still run? One time I had a friend over and he looked at my truck. He took the spark plug out and he said from looking at the colour of the spark plug it looks like the fuel is burning ok. If the fuel is burning ok can i still have engine problem? Thanks for your advice.

ignition wire pressed fully into the distributor? Do you just have to look at the distributor and check the cable? Do you have a picture to show. Man next time I think i will bring my car to the nissan dealer for oil change theen they might be able to see little things that I don't see. At least I don't think my dealer would do such a dishonest thing.

Yes, I think he literally rip all the heat shields off.

I finally changed my two rear O2 sensor. It was easer than i though. I wasn't able to buy PB blaster in canada. But I bough liquid rench. I spray on the and the O2 sensor came out pretty easy with a 22mm rench. The hardest part I find in change the O2 sensor is re-wireing. That took me a few hours because it had to go though a few tight places. After the O2 was in stall I notice I am not getting the 1k vibration from the engine anymore. So everything is good. But now I wonder if it was my mechanic that broke my O2 sensor. I had him remove all my heat shields around my exhaust system and he seems to just rip out everything. Some screws weren't even undone. I think he might have koncked on my sensors and damage it. O2 sensor seems to be quite sensitive it is even written that it can't be drop or it will be damaged. Anyway thanks for eveyone who helped me! Thanks

Thanks for the explaination. That really clear things up for me. Now I can change my O2 sensor on the weekend with confidenance.

Sorry if this is a stuipd question. I am new at this. In the R50 where is Bank 1, Sensor 1 Bank 1, Sensor 2 Bank 2, Sensor 1 Bank 2, Sensor 2 When you say left side does it mean the driver side in US. When you say right side does it mean the passanger side in US.

I heard some store will read the code to you for free. If you want to read the code yourself for R50 pathfinder, I think you will have to get a OBDII code reader.

When they say left and right oxygen sensor. Which side is left? The driver side?

I have 98 Pathfinder. I experience the same problem with hard shift from 1 to 2 gear when driving slowly from the first day I got my pathfinder (sept 1998). I told the dealer about the hard shift before they said it is fine. I had my computer reset numerious time and it never made a different. I have over 144000km on my pathfinder now. I think this is normal.

Oh your O2 was spot welded onto the pipe? How were you about able to take it out and put the new one on? Did you have to weld it back on also? As for sensor I know the exact part that I need. For 98 Pathfinder I need. Bosch Part # 13257 (Rear Left) Bosch Part # 13264 (Rear Right) I will try to call around and see if I can get some prices for it. I call ParSource and canadian tire their price almost identice with the right side over $200. I don't see why the right side being so expensive. PB Blaster I have to see if I can get that product in Canada. Thanks

The one that just came out of my truck was a Bosch, with a Nissan logo stamp on it. It was also one of the rears. As for others, do not forget the dollar difference (you quoted in km so I guess you are not in the US), shipping and duties. Also, the dealer installed item is guaranteed for 20,000 km/12 months (at least in Canada). Edit: Try this web site as well: Bosch4Less (for my truck, thier price was about the same after landing in Canada as the dealers). Thanks for the information. I craw under my truck this afternoon and I saw found all 4 of the O2 sensor in my truck. I took a close look at the two rear sensor and they both said Bosch on it (I didn't see the nissan logo but it might be there). It does look pretty simple to change. i just need to unscrew the o2 sensor rewire the wire and just plugin into the connector. The only problem i might face is I cannot take the O2 sensor out becuase it is rusted on the pipe. Are there any tips on removing rusted nuts other than using WD40 on it? As for warranity Bosch4Less gives out 90 days and no hassle returns. I have no idear what the dealer will give me if i was just to buy the parts. Do they even allow returns? I know canadian tire don't allow return on the O2 sensor.

Well my gararge guy read the code for me he said for sure that the O2 sensor is dead. I saw the code was something rear. The mechanic said rear for sure. Right now I still have no problem starting. It still start fine. But it just take more turns for the starter to start the engine. Before I had all these things change I turn the keys the truck would start almost instantly. Now I turn the key it takes slightly longer (may be 1.5x longer). So you do u think it is just a coincidence that my O2 sensor die? Or do you think my mechanic made some wrong adjustment to my car on the previous service (could he had adjust the engine timming wrong with he changed the timming belt)? I am a beginner in fixing car, freel free to give me your comment. Thanks in advance. P.S. I just found the store http://oxygesensors.com The price is low there. Does anyone have any experiences with it? Do you know if Denso 02 sensor are the nissan OEM parts? Thanks

Oh this is the second time having my O2 fail. The first time was at 43093km on aug 2000. It was under warranity, so It was free to get that fix. I had no idear if it was left or right side that was changed though. On the invoice it said DE47A1 Replace Rear O2 Sensor 90 JIM LIC#:S WPNIS 0.80 1 226A1-0W002 Sensor Does anyone understand what that mean? I guess 226A1-0W002 is the part number but I can't find any information about it on the web. I think there are 4 02 sensor on my truck. I checked all over the web it always pop up with 4 different sensors that I can buy. I justed checked the prices with canadian tire it showed up 4 different sensor too. The price at canadian tire are not much cheaper than dealer though. The left rear side is around 100 but the rear right side is 225. As for the front 02 sensor they are simular prices with the right side being very expensive. I called nissan, the dealer wanted $255can + tax to get one O2 replace. If i just buy the parts alone it is only $132 + tax. So if I do it myself I can changed both at the same price. I have read other thread that changing 02 sensor can help fuel economy. Some people even advice the change left and right together so that the reading will balance. I could use some gas milage improvement when the gas price are rising every week.

I bought my 1998 pathfinder to the garage to do the major service at 144000km. The major service include changing all the fluid, timing belt, spark plug... and emissions test. My emission test pass without any problems. 2 weeks after the service I started to get the engine light when I was driving on the highway. I brought my car back to the same garage. After checking the code, he said my O2 sensor might have die. He reset the code and tell me to come back when the light come back on again. 2 week has passed the engine light come on again when I was driving on the highway. I bring it to the shop and he said O2 sensor is dead and I need to replace 2 of the O2 sensor. The problems don’t seem to stop there. After the major service I also recognized that the engine vibrates suddenly when my pathfinder is at 1000 rpm. The vibration would go away when it is higher or lower than 1000rpm (I never had this problem before). After the major service I also noticed that my pathfinder seems to have a harder time starting than before (My garage suggested me to change the battery). Do you think my garaged changed something wrong and caused all these problems? Or is it a coincident that I just need to change O2 sensor and battery too. What should I do? Should I changed the O2 sensor as he said and all the problem will go away? Please help. Does anyone know if there are 4 O2 sensor in 1998 pathfinder? And how can you tell if it is the driver or passenger side sensor that I need to change? I heard changing O2 sensor is very easy, is that true? Thanks for your help.