Question about 1999 Plymouth Neon

1 Answer

I have 99 plymouth neon,sevice engine light keeps coming on,have replaced both upstream and downstream oxygen sensors,but the code keeps telling me there is no activty on the downstream sensor,have checked all the connections,but don't know where to look next

Posted by on

Ad

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 64 Answers

If it is a trouble code for the downstream oygen sensor, or cataylist below threshold, it pertains to the catalyitic converter. I would check that if i understand you correctly.

Posted on Mar 25, 2011

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Where is the O2sensor bank 1 at with a code of P0420. AND do I need to replace both sensors upstream and down. Or just the one that is showing up on the obd scanner.


Bank one is front side of cat. It should also tell u if it's cat 1 or cat 2. Depending on make an modle an yr. Catalyst 1 bank 2 is left cat back sensor. Catalyst 2 bank 2 is right cat back sensor. U do not have to replace upstream also. My o2 sensor Catalyst 2 bank 2 went bad. Had engine code for burning rich bank 2. Replaced tha down stream sensor an fixed problem runs better an better gas. This was in 97 gmc suburban. Idk what vehicle ur askin about. An I'm not to familiar with much about cars jus trucks an suvs.

Jan 02, 2017 | Cars & Trucks

1 Answer

Code p0420 acura m'dx


1996-newer (OBD-II) vehicles use oxygen sensors and a catalytic converter to reduce emissions. There is one O2 (oxygen) sensor in front of the catalytic converter (called upstream), and one behind it (downstream). When the engine is warmed up and running normally the upstream oxygen sensor reading fluctuates and the downstream one is fairly steady. In the case where both readings are fairly steady, a P0420 check engine light code is set.
Possible Causes: Oxygen (O2) sensor not working correctly
Damaged or leaking exhuast (pipe, manifold, catalytic converter)
Damaged catalytic converter
Diagnostic Help:
To diagnose a P0420 trouble code we begin by checking for exhaust leaks under the vehicle. Then use an oscilliscope to check the waveforms of both upstream and downstream O2 sensors. The front reading should vary, the rear should be steady. Replace as necessary. Check the rear Heated O2 Sensor. Check the catalytic converter, replace if necessary. If necessary, check for wiring and component concerns. See our article "Automotive Circuit Testing 101", if you need more assistance with this. Remember to refer to an model-specific repair manual for proper instruction.

Jan 20, 2014 | 2005 Acura MDX

2 Answers

Check engine light on displaying P1494, P1495 and oxygen sensor


code p 1494 refers to EVAP system leak detected
p1495 is EVAP solenoid /valve fault when searching for fault codes go to the browser page and type in --- fault code ( what ever code you get -- there are plenty of pages describing the fault and how to fix

one entry for each code

Dec 13, 2017 | 1997 Dodge Neon

1 Answer

Low voltage oxygen sensor (upstream).


This code does not mean to replace the sensor , testing is what is suppose to happen .
P0131 O2 Sensor Circuit Low Voltage Bank 1 Sensor 1

Honda Civic P0131 02 Sensor Diagnosis

Dec 06, 2017 | 2000 Buick Century

1 Answer

Hey guys im pulling a p0138. i have a 99 jeep cherokee limited i checked the 15 amp fuses and replaced the upstream and downstream o2 sensors and it still keeps popping up. The check engine light is still...


Harness or connectors (The sensor circuit is open or shorted). Rear heated oxygen sensor (Bank 1) may be faulty. The rear heated oxygen sensor (or sensor 2), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Check your connections and make sure the right sensor is in the right location.

Dec 30, 2010 | 1999 Jeep Cherokee

2 Answers

Check Engine Light


P1133 HO2S Insufficient Switching - Read Our Article On Oxygen Sensor Codes For Help With This Pontiac Trouble Code (check your oxygen sensor also called O2 sensor)

All the codes you have listed come back and refer to the oxygen sensor. I would say that it is your problem. you vehicle may have 2

please do not forget to rate and comment about your experience with fixya
Thank you and happy holidays

Dec 09, 2009 | 2002 Pontiac Firebird

2 Answers

How many oxygen sensors in a 2001 chrysler sebring 3.0


17c3292.jpg

Fig. Heated Oxygen (HO2S) location (sensor 1)-2.4L engine

db6f426.jpg

Fig. Heated Oxygen (HO2S) location (sensor 2)-2.4L engine

99e413c.jpg

Fig. Heated Oxygen (HO2S) location (bank 1, sensor 2) (bank 2, sensor 2)-2.7L engine

e2a250f.jpg

Fig. Heated Oxygen (HO2S) location (bank 2, sensor 1)-2.7L engine

I hope help you with this (rated this help). Good luck.

Sep 09, 2009 | 2001 Chrysler Sebring

1 Answer

Replace oxygen sensors


these engines have 1 upstream o2 sensor and 1 downstream o2 sensor..the 1 in the rear exhaust manifold is the upstream and the 1 after the converter is the downstream..make sure you replaced the right one

May 15, 2009 | 1998 Plymouth Grand Voyager

1 Answer

1996 Neon is blowing black smoke from the exhaust.


If good, clean fuel, good spark etc. 171 is lean mixture according to my sources.. Thus I'd say if engine is being told from O2 sensor that mixture is lean, that would explain all the extra fuel getting ( dumped ) fed to engine. I guess i"d start by changing O2 sensor. (Oxygen sensor.) If it has 2, do the one upstream, closest to engine on exhaust manifold or pipe.

Dec 30, 2008 | 1996 Plymouth Neon

Not finding what you are looking for?
1999 Plymouth Neon Logo

Related Topics:

150 people viewed this question

Ask a Question

Usually answered in minutes!

Top Plymouth Experts

yadayada
yadayada

Level 3 Expert

79865 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8836 Answers

Are you a Plymouth Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...