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Oil first - always. P0024 is the Bank 2 exhaust mirror of P0015. Most P0024 codes are caused by oil starvation at the cam phaser. Use a Bluetooth OBD2 scanner to watch commanded vs actual cam timing live before condemning hardware. See top-rated scanners on Amazon ↑
🗺️ Where Is the Problem?
Blueprint view - P0024 timing fault at the Bank 2 exhaust cam phaser/OCV (oil-pressure driven)
These are statistical causes across ALL vehicles - your exact car may rank differently
For example, on a Honda 4-cyl the downstream O2 sensor causes P0024 64% of the time, but on a GM 5.3L V8 the catalytic converter is the cause 71% of the time. Get a probability ranking built specifically for your year, make, model, and mileage.
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🎯 Top Causes & Probability
60%
#1 - Most Likely
Low or Dirty Engine Oil / Sludge
The exhaust phaser on Bank 2 is fully oil-pressure driven. Low oil, dirty/sludged oil, or a clogged pickup screen prevents the phaser from advancing. Change the oil with the correct viscosity before doing anything else.
🔩 Part
$30–$80
👨🔧 Labor
$0–$60
⚡ DIY Difficulty
Easy
30%
#2 - Check First
Stuck Bank 2 Exhaust OCV
The oil control valve gets clogged with varnish or fails mechanically, blocking oil flow to the phaser. Pull the solenoid, inspect the screen filter, and bench-test resistance and movement.
🔩 Part
$50–$180
👨🔧 Labor
$60–$140
⚡ DIY Difficulty
Easy–Medium
10%
#3 - Less Common
Worn Cam Phaser / Stretched Timing Chain (Bank 2)
After the OCV is ruled out, look at the cam phaser internal vanes/lock pin and the timing chain. Cold-start rattle is the giveaway. Repair is labor-heavy and usually shop-only.
🔩 Part
$300–$1,200
👨🔧 Labor
$600–$2,000
⚡ DIY Difficulty
Hard
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Check oil level & condition first - Pull the dipstick. If oil is below the min mark, dark, or smells burnt, do a full oil change with the correct viscosity. Many P0024 codes are oil-only fixes.
- Inspect & bench-test the Bank 2 exhaust OCV - Remove the OCV from the Bank 2 head. Check the screen filter for debris. Resistance should be 6–12 ohms; apply 12V briefly to confirm the plunger moves freely.
📍 Find a Trusted Shop Near You
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Tips for Choosing a Shop
- Ask if they charge a diagnostic fee and whether it applies toward the repair
- Request a written estimate before approving any work
- Ask specifically about the part brand - OEM vs. aftermarket matters for this code
- Check Google reviews for recent mentions of the specific repair you need