Set the Instant Pot to sauté mode and add the olive oil. Once hot, cook the onion for 3 minutes until it softens.
Stir in the garlic, chipotle peppers, cumin, smoked paprika, and oregano. Cook for 1 minute until fragrant.
Add the lentils, fire-roasted tomatoes, vegetable broth, and salt. Stir to combine and scrape any bits from the bottom.
Secure the lid and set the valve to sealing. Cook on manual high pressure for 15 minutes.
Allow a natural pressure release for 10 minutes, then quick release any remaining pressure.
Stir the stew and serve with fresh cilantro and lime wedges.