# 2005 Nissan Pathfinder check engine light **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** nissan, pathfinder, check-engine-light\ **Created:** [June 27, 2018, 1:11am UTC](https://community.cartalk.com/t/2005-nissan-pathfinder-check-engine-light/119900 "2018-06-27T01:11:36Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![williamvarenz](https://avatars.discourse-cdn.com/v4/letter/w/b9bd4f/32.png) [@williamvarenz](https://community.cartalk.com/u/williamvarenz)\ **Post date:** [June 27, 2018, 1:11am UTC](https://community.cartalk.com/t/2005-nissan-pathfinder-check-engine-light/119900/1 "2018-06-27T01:11:36Z")
check engine lite is on,runs fine till i want to accelerate,lite blinks for 10-14 seconds then it smooths out ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [June 27, 2018, 1:29am UTC](https://community.cartalk.com/t/2005-nissan-pathfinder-check-engine-light/119900/2 "2018-06-27T01:29:42Z")
> [@williamvarenz](#): > > check engine lite is on That means you have a problem with the engine. If you have the codes read at a local auto parts store, for free,and post them back here. All of them. We will try and help you. If you aren’t going to fix it yourself, take it to a mechanic and they will read the codes and diagnose what is wrong. ---
**Author:** ![Yosemite](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/yosemite/32/643_2.png) [@Yosemite](https://community.cartalk.com/u/Yosemite)\ **Post date:** [June 27, 2018, 3:31pm UTC](https://community.cartalk.com/t/2005-nissan-pathfinder-check-engine-light/119900/3 "2018-06-27T15:31:53Z")
> [@williamvarenz](#): > > ,lite blinks for 10-14 seconds then it smooths out This means that continued driving will cause major engine damage. Yosemite ---
**Author:** ![MikeInNH](https://avatars.discourse-cdn.com/v4/letter/m/a587f6/32.png) [@MikeInNH](https://community.cartalk.com/u/MikeInNH)\ **Post date:** [June 27, 2018, 5:41pm UTC](https://community.cartalk.com/t/2005-nissan-pathfinder-check-engine-light/119900/4 "2018-06-27T17:41:34Z")
> [@Yosemite](#): > > This means that continued driving will cause major engine damage. Not it doesn’t. There’s a possibility it could…but really depends on what code is generated. ---
**Author:** ![Yosemite](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/yosemite/32/643_2.png) [@Yosemite](https://community.cartalk.com/u/Yosemite)\ **Post date:** [June 28, 2018, 12:35am UTC](https://community.cartalk.com/t/2005-nissan-pathfinder-check-engine-light/119900/5 "2018-06-28T00:35:56Z")
My mistake. I should have worded it "This means that continued driving CAN cause major engine damage. Yosemite '. ---
**Author:** ![williamvarenz](https://avatars.discourse-cdn.com/v4/letter/w/b9bd4f/32.png) [@williamvarenz](https://community.cartalk.com/u/williamvarenz)\ **Post date:** [June 29, 2018, 1:28pm UTC](https://community.cartalk.com/t/2005-nissan-pathfinder-check-engine-light/119900/6 "2018-06-29T13:28:43Z")
codes po300,cnf,po420cnf ---
**Author:** ![thegreendrag0n](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/thegreendrag0n/32/9265_2.png) [@thegreendrag0n](https://community.cartalk.com/u/thegreendrag0n)\ **Post date:** [June 29, 2018, 2:10pm UTC](https://community.cartalk.com/t/2005-nissan-pathfinder-check-engine-light/119900/7 "2018-06-29T14:10:01Z")
> **[P0300 Nissan - Cylinder Misfire Detected Random Cylinders](https://www.autocodes.com/p0300_nissan.html)** > > When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring. > **[P0420 Nissan - Catalyst System Efficiency Below Threshold Bank 1](https://www.autocodes.com/p0420_nissan.html)** > > The Engine Control Module (ECM) monitors the switching frequency ratio of heated oxygen sensors 1 (front O2 sensor) and heated oxygen sensors 2 (rear O2 sensor). A three way catalyst converter (Manifold) with high oxygen storage capacity will... “300” is a bad one, it can indeed lead to the engine damage and needs to be addressed ASAP “420” is “your catalytic converter SEEM to be bad” - it is lesser urgency to address this one, and I would not rush going into an expensive replacement, but would ratehr replace a downstream oxygen sensor, these are really cheap, then cleared the code and drive for 200-300 miles, if it returns, then it is indeed a catalytic converter FYI - “bank 1” is the passenger side in this engine