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O2 Heater Codes.P0032 & P0038

Tiny
SEEKEROFYAH
  • MEMBER
  • 2004 CHRYSLER PT CRUISER
  • 2.4L
  • 4 CYL
  • TURBO
  • FWD
  • AUTOMATIC
  • 189,000 MILES
Car will give these codes and go into 'limp mode' run rough and die. Will not restart unless power removed from ECM to clear and codes will return within 5 miles run rough and die. Unable to clear with handheld code reader. Mechanic said O2 heaters and circuits fine. So I purchased refurbished 'plug and play' ECM from ebay. Got new codes P1189 & P1105 for TIP sensor and solenoid. TIP sensor is new so online company sent me 2nd ECM which gave new codes of P0700 & P0755- not communicating with Transmission and car would not shift from first gear. So online company sent me 3rd ECM which gave P0032 & P0038. They refunded ALL my money. Now purchased ECM from different online company and getting P0032.

What I have Done:
-Swapped ASD relay with horn relay.
-Unplugged Sensor 1 and measure 3.6 ohms heater resistance with no short to ground and only 9.5 Volt supply? Supply ground is good and Hot wire is 2.8 Ohms to ground?
-Unplugged sensor 2 and measure 4.3 ohms heater resistance and 10.7 Volt supply. Supply ground is good and Hot wire is open to ground.
Any assistance on my next step is greatly appreciated.
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Thursday, March 17th, 2016 AT 10:25 PM

13 Replies

Tiny
CAR-MAN145
  • MECHANIC
  • 321 POSTS
You need to get battery voltage to voltage supply try just putting a jumper wire from battery to power supply wire to see if it takes care of the problem if it does then find the week part of the wire or just replace the wire
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Thursday, March 17th, 2016 AT 11:24 PM
Tiny
SEEKEROFYAH
  • MEMBER
  • 6 POSTS
Okay, makes sense. I wonder does this supply voltage originate from an external relay or from an internal relay in the ECM. Just curious if maybe bad contacts? I will make a jumper and perform this test as you have explained. If this test resolves the fault I will need to follow the wire loom to its origin unless a wiring diagram can show me the origin. Also sensor 2 seems to be borderline low Voltage level and may be causing intermittent code P0038. Just thinking out loud. If Supply Voltage origin is from ECM I may need to return to Seller while I still have the opportunity to do so or test the Voltage at the source. Thank You for sending me to next steps
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Friday, March 18th, 2016 AT 12:12 AM
Tiny
CAR-MAN145
  • MECHANIC
  • 321 POSTS
Just make sure all your power and grounds going into the ECM are good you know what they say garbage in is garbage out.
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Friday, March 18th, 2016 AT 10:27 PM
Tiny
SEEKEROFYAH
  • MEMBER
  • 6 POSTS
Applied 13.9 Volt to supply of Sensor 1 Heater and code P0032 still flashed immediately. Cleared code 3 times and still returned immediately..I did not cut any wires I simply removed part of the supply housing and alligator clipped exposed wire to + of battery, hope this was correct..I measured the V at exposed wire so it was getting battery V. With jumper removed I measured 10.07 volts to heater but code initiates within 15 seconds and Voltage drops to 1.1V? Removed 4 Connectors from ECM and Measured Voltages and all direct hots were reading 12.1V so appears ECM is getting proper supplies. Also checked all ECM connector sockets to ground with battery and had so many variables I can not confirm all proper grounds but did find several very good grounds(.4 ohms to 6 ohms). I double checked measurements between sensor 1 & Sensor 2 for comparison. Both heaters measure approx 4 ohms. Sensor 1 heater circuit reads 27 ohms through computer and open to ground when computer disconnected. Sensor 2 reads 23 ohms through computer and open to ground when computer disconnected. Not sure what to check next, maybe time to visit the dreaded dealer?
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Saturday, March 19th, 2016 AT 2:24 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,895 POSTS
It sounds like the 02 heater circuit is shorted, please try a replacement and get to us.

Here is a link that will help

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Please let us know what you find
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Saturday, March 19th, 2016 AT 7:09 PM
Tiny
SEEKEROFYAH
  • MEMBER
  • 6 POSTS
NEW OEM Denso O2 sensor gives same immediate code P0032. Removed power for 1 hour for factory reset on EMC and still immediate code. Excellent Ground Reading to sensor plug negative. OL between +positive at sensor plug(harness) and ground so no sign of short. Excellent continuity from ECM plug to O2 plug +positive(harness).I'm at a total loss here? Voltage now only reads.1V(point 1V) feeding upstream O2 Heater Circuit. Cleared code reappears when key is turned on but vehicle is not even running yet. New O2 sensor measures 3.8ohms across heat circuit.I attempted to send 13.9 V battery power to heat circuit again but cleared code still appears immediately. Promised ECM seller I would contact them by tomorrow to give status. They will refund or replace? Any advice is greatly appreciated.(Thinking refund and visit to dealer? Yuck:)
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Wednesday, March 23rd, 2016 AT 8:08 PM
Tiny
KEN L
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  • 42,895 POSTS
Yep, there are only two things I can think of to do,

1. A pin to pin check of resistance on the 02 sensor circuits while testing ohms to ground as well to check for shorts or high resistance connections

2. The PCM is bad

Let me know what you find please
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Wednesday, March 23rd, 2016 AT 9:35 PM
Tiny
SEEKEROFYAH
  • MEMBER
  • 6 POSTS
UPDATE: Spoke to Ebay ECM seller and explained low(no) Voltage to upstream O2 heater. They want me to return ECM and my original (bad?) ECM for them to diagnose and compare both units to determine next step(Refund/Repair/Advice). Here's the catch.I reinstalled MY original ECM and NO check engine light after 5 mile test drive. Going to put some miles on her tomorrow for a solid test.I also read in a forum today that a cluster of ground wires at grounding lug near left fender next to battery are notorious for many intermittent electrical issues so I will pull battery and inspect this lug for loose, broken, dirty connections before test drive.
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Thursday, March 24th, 2016 AT 8:00 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,895 POSTS
Did this fix the problem?
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Friday, March 25th, 2016 AT 11:13 PM
Tiny
SEEKEROFYAH
  • MEMBER
  • 6 POSTS
YES. Car now has 200 miles with original ECM and NO check engine light. Simply by changing the upstream O2 sensor. Old sensor tests fine but must have some sort of intermittent problem with the internal heat element? I guess.

2 local mechanics sent me on this journey of 4 different ECM's. Crazy how all the re-manufactured ECM's were giving different codes. Had me convinced that they must be the problem lol. Huge learning curve on this one :) Thank You for ALL the advice, Hope it may help someone else in the future.
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Sunday, April 3rd, 2016 AT 7:56 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,895 POSTS
Yep, it happens, I have heard about an 02 heater shorting out, super rare. This will help others please fell free to use 2CarPros. Com anytime :-)
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Monday, April 4th, 2016 AT 1:14 PM
Tiny
THOMAS JAMES
  • MEMBER
  • 2 POSTS
Car is giving me this problem right now. 2004 Neon SRT4. Has been for months. Replaced countless o2 sensors, changed plugs, wires, coil. Still happens. I have no idea on what else to check.
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Sunday, February 9th, 2020 AT 8:15 PM
Tiny
JOETECHPRO
  • MECHANIC
  • 705 POSTS
Hey THOMAS JAMES,

Can you please start a new thread with you car question?

Follow https://www.2carpros.com to get to the home page and run through your vehicle selection and input you question again there.

We will get to helping you ASAP

Much appreciated.

Regards, Joe
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Monday, February 10th, 2020 AT 10:42 PM

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