ncdragbike

RX300 codes P0171, P0330, P0250

Recommended Posts

So my wife's 99 RX300 lit the check engine light and went into limp mode. Had the codes read and showed 2, one for air fuel ration and another for knock sensor voltage. I replaced the AF sensors front and rear first just because they are easy. no change. Next I replaced both of the knock sensors. this cured the knock sensor code but left me with a Lean Misfire on Bank 1. I cleaned the MAF, same thing so I replaced it, still the same. The last round I decided to replace the fuel injectors. While I had the intake off again I replaced the plugs and swapped the coils from the front bank to the rear, (if I did have a coil issue the code would should banks). It did run OK if you drive it like a Grandma. If you get on it, it will miss an sputter in the upper RPM range and throw the check engine light. P0171, P0330, P0250 are the current codes. Knock sensors are new along with other parts. right now I'm leaning to fuel delivery problems, fuel pump or pressure regulator.

I drive a truck OTR so I'm not home but a limited amount of time and have a limited amount of internet access  Because of that I've been dealing with this for over 6 months. Luckily I have a 92 Ford Explorer with 250,000 miles the purrs like a kitten she can drive 

Any insight would be appreciated

Vehicle is a 1999 RX300 AWD 140,000 miles. had a new timing belt and water pump @ 120,000, O2 post cat and exhaust repair @ 125,000 along with parts mentioned in the post.

 

Share this post


Link to post
Share on other sites
 

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

  • Similar Content

    • By alex2354
      I'm looking for answers to my mysterious knock sensor code on my 2001 LS430 180k miles. P0325 Knock sensor circuit 1 is the code I am recieving. Trying to do some preventative maintenance I changed the spark plugs with NGK laser iridium. Prior spark plugs I believe were the Densos. I as well changed a leaky PCV hose and went ahead and did the valve. The car ran great for roughly a week or so and then the code came and hasn't left. I seafoamed the car as well after getting the code. If I reset the code the car runs great, but returns shortly. I notice a slight tick and pinging under hard acceleration. Any suggestion would greatly be appreciated! I changed the spark plugs again also hoping maybe one of the NGK's was gapped incorrectly. I've went over the harnesses looking for shorts. It just seems strange I change the spark plugs and a knock sensor decides to give out. 
    • By joep54
      I have a 1999 RX 300 with 186k miles on it.  Kept getting code for knock sensors, so i had mechanic change the sensors as the car would no go out of overdrive.  Well had Knock sensors replaced and the P0325 and P0330 came back and car will not go into overdrive again.  Any suggestions on what else to try.  I have put in the Premium gas but that has not helped.  The car runs great but MPG is down and worry about log trips.  Will take any suggestions to help take care of problem or can i just  drive it like it is?  
    • By Gtfourever
      Hello everyone, I have a 99 ES300. When I bought the car it had a check engine code, ended up being both knock sensors so I replaced them both along with the harness. I took it for a test drive and within 2 miles the codes pop up again 😔. I used aftermarket parts so I figured that was the problem. Then I repurchased the parts all with OEM this time, I get it all back together and again 2 miles down the road and code P0325 pops up car again goes into limp mode. So to sum it up I replaced the knock sensors and harness twice with NO cure to the problem. Could I be missing something or does this problem run deeper? Has anyone else experienced this problem?
    • By alecxjk
      So basically here is whats happening. I own a 1992 es300 with 112,000 miles on it. I bought the car about 3 months ago with 105,000 miles on it. All in all its a pretty decent set of wheels for a poor 22 year old college student, however it has a couple of problems. The primary issue is this. When I stop at a light and the car is idling it will idle at about 750rpm, however after idling for a couple of minutes it will drop to about 500rpms, and this is when a single misfire occurs. The misfire is completely random, and sometimes doesn't happen at all, however i noticed when the A/C or heater or just the fan for the vents is on, the misfire seems to be more consistent. The car does not misfire while driving, only when idling or after freshly shifting into gear. This problem is driving me crazy, Ive replaced the O2 sensors, the spark plugs, and got a complete tune up done. There is no check engine light. Ive done a ton of research and from what I can tell it is either the ignition coils failing, or something to do with the fuel injectors. But before i shell out more money that I dont have I was wondering if anyone has any opinions on the issue or has experienced a similiar issue themselves? Also i feel it neccecary to mention the transmission is slipping, not all the time, but sometimes it does slip, im taking it to get looked at next week. Its a great car and honestly Id hate to get rid of it so soon.Thanks in advance for anyone who responds, i really appreciate it. Also I read on here that i should be using 91 octane fuel instead of 87 is this true?
    • By Holger
      Hallo together,
      first please excuse my bad English.
      My Name is Holger I´m from Germany and I did bought (may not a good deal) a 00 LS 400 with low mileage.
      but it seems the knock Sensor is not working.
      OBD Error: P0325 - Generic
      Type Powertrain - Ignition System or Misfire - ISO/SAE Controlled
      Description
      Knock Sensor 1 Circuit
      Location Bank 1 or Single Sensor I did found by searching:
      in http://us.lexusownersclub.com/forums/topic/31948-replace-knock-sensors/

      You can change the knock sensors and wire harness without removing the intake manifold. Remove the EGR valve, PCV hose and you can get you hand into the V area of the block. A 27mm socket and small rachet with a flex head and the job is done.
      and in an other board:
      "
      IThe good news is that I just finished changing the right-side knock sensor, and the problem is fixed (no more pinging). It was fairly easy to change the sensor. The whole job including test drives took about 1 1/2 hours. I removed a couple of the plastic cover pieces between the manifold and the valve cover, and with a long screwdriver, gently removed the connector on the sensor (accessed on the right side of the engine thru the small openings around the manifold). I removed the knock sensor using a long 3/8 extension with a universal joint and a 1 1/16" sensor socket taped together to hold the tools together. I installed the new sensor using tape on the socket to hold it in place. FYI - The sensors are very tight in the block
      Read more: http://www.clublexus.com/forums/ls-1st-and-2nd-gen-1990-2000/183789-gen-1-ls400-knock-sensor-replacement.html#ixzz3sKFHmoMt
      "
      So my question i did not find an Answer:
      does this way to do the work similar with the VVTI Engine in the Late LS400? (Both up are for the older Engines)
      and may if any ever did change in the late Engine, did you use an OEM Part without Problems?
      Thank You!