Skip the auto shop - Our mechanics make house calls

Q: All 4 heated O2 circuit high, and alternator not charging

asked by on

Ive swapped out alternator with a good one from my other stratus and still no charging.all 4 heated o2 circuit high and I've replaced all 4 O2 sensors and replaced PCm. I'm very mechanically inclined and i cant figure this out. Please help!

My car has 132000 miles.
My car has an automatic transmission.

As you may know, the alternator is unrelated to the O2 sensors and these will not impact the charging of the battery. The charging issue may be related to a bad voltage regulator which is a unit that monitors the charging of the battery by the alternator to be sure that it does not over charge or under charge the battery.

When this is not working properly, this can cause an otherwise good alternator to not charge the battery properly. I would recommend having the alternator and voltage regulator tested to determine what may be causing the problem. If you would like consult another expert for a second perspective, a certified technician from YourMechanic can come to your car’s location to help diagnose the charging problem and pinpoint the fix.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Gears slipping

Hello! The most common cause for transmission slippages is dirty or low transmission fluid. However, the code retrieved from the vehicle could indicate anything from a loose gas cap, to a bad exhaust system, so it would be best to...

Q: Truck shuts off when i stop before I hit the brake pedal but idles just fine. What can cause that to happen?

Hello. Engine stalling can be caused by many things. A few common causes are issues with the fuel, ignition, or engine management systems. If any of the components to one or more of these systems fails or has an issue...

Q: Check engine light

This can happen occasionally for a variety of reasons and can sometimes be related to things that can change in the atmosphere such as air temperature and density for example. This can impact something like a throttle body temperature sensor....

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.