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P0032 and P0108 Fault Codes on 2004 Jeep Grand Cherokee: Causes and Fixes

Model: 04 Grand Cherokee Fault Code: P0032 Posted: 2011-10-22 22:33

Hello everyone, I own a 2004 Jeep Grand Cherokee with a 4.7L V6 engine, and I'm currently experiencing three diagnostic trouble codes: P0032 (Oxygen Sensor Bank 1 Sensor 2 - High Voltage), P0132 (Oxygen Sensor Bank 1 Sensor 2 - Low Signal), and P0108 (Manifold Absolute Pressure Sensor - Low Input). All of these codes indicate high or low voltage readings, which suggests a potential sensor malfunction. My question is: do all three sensors need to be replaced, or could one faulty component—such as the MAP sensor—be causing false readings in the oxygen sensors? For example, if the MAP sensor provides incorrect air-fuel mixture data, it might lead to improper engine operation and cause the O2 sensors to register abnormal signals. I'd like to avoid replacing all three parts unnecessarily. Any insights or troubleshooting steps would be greatly appreciated! Thanks in advance.

Related fault codes
P0032P0108
Comments (6)
Anonymous 2011-10-23 07:21

What is the engine size? The 4.7L V6 is common on this model year, so that might help narrow down potential causes.

Anonymous 2011-10-23 07:49

It's a 4.7L engine—thank you for pointing that out; I should have included it in the original post.

Anonymous 2011-10-23 21:43

I suspect the MAP sensor is faulty. If it sends incorrect pressure data to the ECU, it could misread the air-fuel mixture, leading to improper combustion and false readings from the O2 sensors. I'm replacing the MAP sensor tomorrow and will update with results.

Anonymous 2011-10-24 05:19

I'm skeptical—how could a faulty MAP sensor cause O2 sensor errors on only one bank of a V8 engine? That seems unlikely. It's more probable that either the upstream O2 sensors are failing or there's an underlying wiring issue affecting signal transmission.

Anonymous 2011-10-31 09:25

Good point—your theory is holding up so far. I replaced the MAP sensor, and surprisingly, the O2 sensor codes (P0132 and P0032) disappeared. Now I'm checking the wiring harness with a multimeter to rule out any signal interference or grounding issues.

Anonymous 2011-10-31 20:00

Be sure to inspect the PCM connectors for power steering fluid contamination—leaking fluid from a faulty power steering switch can seep into the wiring and cause intermittent sensor faults or false readings.