1989–1994 Nissan 240SX
By Ray Delgado ✓ Certified Mechanic · Published Sep 21, 2026 · Updated Oct 22, 2026
Save $112 by doing it yourself! Shop cost: $300
Quick answer: 12V Battery Replacement on a 1989–1994 Nissan 240SX is rated Easy and takes about 30-90 minutes. You'll need 2 tools for this job, and parts cost about $188. This guide walks you through the full job step by step, including the mistakes to avoid.
| Part Name | Part Number | Price | Buy |
|---|---|---|---|
| Replacement 12-volt battery for 1989-1994 Nissan 240SX; verify group size, CCA, terminal layout, and VIN fitment | — | $180.00 | |
| Anti-corrosion terminal protectant or felt washers | — | $8.00 |
About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.
💡 Pro tip: Order all parts at once to save on shipping
Follow these steps carefully
Groups 26 and 34 show up as alternates in parts catalogs, so read the group code on your old battery and match its size and terminal layout before buying. Confirm the failure first: slow cranking or dim lights point to the battery.
Disconnecting the battery clears the radio presets and clock — note your stations first. Wear eye protection and gloves, and keep sparks and open flame away from the battery area.
Open the hood and find the battery in the engine compartment. Note the cable routing and photograph the terminal layout. Clear tools and loose hardware from the area so nothing metal can bridge the terminals.
Loosen the negative clamp and lift it off first, tucking the cable where it cannot spring back onto the post. Remove the hold-down hardware, then loosen and remove the positive cable.
Lower the new Group 24 battery into the tray inside the heat shield, in the original orientation with the positive terminal at the top left. Refit the hold-down and tighten it just until the battery cannot shift — overtightening can crack the case. Connect the positive cable first and tighten it snug, then the negative. Coat both terminals with anti-corrosion spray.
Reset the clock and re-enter your radio presets. If a battery warning light was on before the swap, confirm it is gone; a persistent light with a new battery means the charging system needs testing.
With the engine idling you should see 13.5 to 14.5 volts across the terminals and no warning lights. Confirm headlights and accessories run steadily. Return the old battery to the parts store for its core refund and proper recycling.
Battery jobs have bitten me before: Keep the factory heat shield in place — it protects the battery from exhaust heat, and tossing it during the swap is the fastest way to shorten a new battery's life.
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
1989–1994
1989–1994
1995–1998
1995–1998
1995–1998
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