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sprinkles08
sprinkles08, Chrysler/Dodge/Jeep master tech
Category: Dodge
Satisfied Customers: 22286
Experience:  ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans and Hybrid Specialist
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Chrysler neon: I'm working on a 96 Dodge Neon 2.0 that has

Customer Question

I'm working on a 96 Dodge Neon 2.0 that has a constant code p0171 - running lean. When I put a scope on the O2 ( which was replaced with a new Bosch ) I get a nice normal up down trace at idle. If I open the throttle a bit i can still see a nice, fast up/down trace between about .1V to .8V, but only for maybe a minute, and then the voltage rises to a little over a volt and just stays there until i let it come back to an idle, after which the O2 shows normal again until I open the throttle, at which time it will immediately jump back up to about 1.1 V. Since this is exactly what happened with the old O2 sensor, I'm suspicious of a problem in the harness. Any ideas ?
Submitted: 1 year ago.
Category: Dodge
Expert:  sprinkles08 replied 1 year ago.
Hello and welcome to JustAnswer!
You may have a fuel pressure or MAP sensor issue but the issue may sill e with the oxygen senor. Aftermarket sensors, Bosch in particular, usually cause repeat issues. They're usually inaccurate, most often from an incorrectly functioning internal heater.
Has fuel pressure been tested?
Has the MAP signal been compared to a vacuum gauge?

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