← Back to list

2004 Dodge Dakota 4.7L P0175 Code: Rich Mix, Misfire, and Engine Idle Issues

Model: 2004 Dodge Dakota Fault Code: P0175 Posted: 2012-01-06 08:53

I own a 2004 Dodge Dakota 2WD with a 4.7L V8 engine. Recently, the vehicle started throwing a random multiple misfire code (P0300), followed by a P0175 code indicating a rich fuel mixture on Bank 2. I replaced all eight spark plugs and cleaned the MAF sensor, also swapped out the air filter. The engine starts fine at idle—initially running smoothly around 800–900 RPM—but drops to about 600 RPM and runs roughly when driving, with noticeable power loss. After replacing the plugs, I noticed that cylinders 1 and 8 had blackened spark plugs, which led me to suspect faulty fuel injectors. Is this a reasonable diagnosis? I’ve also observed intermittent P0172 (rich mixture on Bank 1) codes, though they appear less frequently. The exhaust manifold connection for Bank 2 was previously loose but has been tightened several months ago. Any insights into potential causes—especially related to the O2 sensors, fuel pressure, or engine mechanical wear? I’m considering replacing the injectors on cylinders 1 and 8, but want to confirm if there are other more likely root causes before investing in parts.

Related fault codes
P0175
Comments (16)
Anonymous 2012-01-06 09:07

Also note that P0172 has appeared once or twice alongside the P0300 code. This suggests a potential lean/rich imbalance across both banks.

Anonymous 2012-01-06 10:00

Check your fuel pressure and related components such as fuel filter, injectors, and fuel pump. Low pressure can cause rich conditions or misfires.

Anonymous 2012-01-06 12:01

The 2004 Dodge Dakota does not have a MAF sensor—this is incorrect information. It uses an intake air temperature (IAT) sensor and relies on other sensors for load detection, so cleaning a non-existent MAF sensor is irrelevant.

Anonymous 2012-01-06 14:43

Apologies—I meant MAP sensor, not MAF. The MAP sensor monitors engine vacuum and helps regulate fuel mixture.

Anonymous 2012-01-06 20:12

A MAP sensor does not typically cause a rich condition on only one bank of an 8-cylinder engine. Check the oxygen (O2) sensors on Bank 2, especially for signs of contamination or failure.

Anonymous 2012-01-11 08:46

The O2 sensors are now showing rich readings on both banks. I’ve replaced the injectors on cylinders 1 and 8 today and will update if this resolves the P0175 code.

Anonymous 2012-01-11 13:56

It’s unlikely to be faulty injectors alone. First, inspect all O2 sensor connectors for corrosion or oil contamination—this can cause false readings and trigger rich codes.

Anonymous 2012-02-09 08:50

I replaced both O2 sensors, but the vehicle still runs rough with the P0175 code. Does anyone have any other troubleshooting suggestions?

Anonymous 2012-02-09 09:09

Check for oil buildup in the O2 sensor connectors and at the PCM connector—oil contamination can cause erratic readings and misfires.

Anonymous 2012-02-09 09:10

No visible oil in either the O2 sensor or PCM connectors. The system appears clean, but the issue persists.

Anonymous 2012-02-09 09:19

To clarify: when the engine starts, it runs smoothly at 800–900 RPM initially, then drops to around 600 RPM and idles roughly. I also forgot to mention that the Bank 2 exhaust manifold connection was previously loose but has been re-tightened several months ago.

Anonymous 2012-02-09 18:08

What brand of O2 sensors are you using? Some brands perform better than others in older engines like this one.

Anonymous 2012-02-15 11:43

I’m currently using Bosch O2 sensors. I’ve replaced them twice, but the issue remains.

Anonymous 2012-02-15 13:40

Consider switching to NTK O2 sensors—many users report better performance and reliability in older 4.7L engines with this brand.

Anonymous 2012-02-16 18:53

I’ll try that. Are there any other factors I should consider? The engine does produce a knock sound, but I’m unsure whether it’s due to running rich or another mechanical issue like valve train wear.

Anonymous 2012-02-17 06:00

If the knock originates from the bottom end—such as bearing failure—or if there's a rattle from the front timing cover, be cautious about spending money on injectors. The 4.7L engine has known design flaws including weak valve springs, head gasket issues, and timing chain problems. Additionally, if one of the camshafts has shifted out of time, it can cause a rich condition on one bank.